Okay, deep breath. She's fine right now.
It looks to be either just some runny droppings due to the blueberries and/or a lot of water that she drank, or she may have a bacterial or fungal infection in her GI Tract. As already mentioned, if she is acting normally and eating normally, isn't lethargic, sleeping a lot, vomiting, constantly fluffed-up, at the bottom of her cage, etc. then she's doing just fine for right now. Be sure to take a fresh sample of her droppings in with you on Tuesday, as your Avian Vet should do both a Culture and microscopy on it.
*****Now, about her diet...First of all, regardless of what the main staple of her diet is (in this case it's the Roudybush pellets), she still needs to eat a lot of other things to get not only her complete physical nutrition every day, but also her MENTAL nutrition. "Pellets" are great, but they tend to give bird owners a feeling of "Great, that's all my bird needs", like they're a superfood or something, and that is just not the case at all, in fact it's far from it.
***Pellets do not exist in nature!!! Think about that for a minute...Birds bodies are built, designed, were created so that they can eat a huge variety of foods, which include seeds, grains, legumes, nuts, fresh veggies, etc. Their bodies nor their minds were created to be satisfied or fulfilled by pellets...So yes, the pellets should be the main staple of her regular, daily diet...However, she still needs to get a small amount of a healthy, fortified, low-fat and non-sunflower seed, varied seed-mix every day, as they absolutely need to eat seeds to keep their GI Tracts healthy. In addition, this will help to fulfill her foraging instincts. Pellets do neither of these. Pellets do nothing to keep their GI Tracts functioning properly, nor do they have to forage or use their beaks to "shell" pellets...We are getting so worried about seed-mixes being "bad" for our birds that we're all forgetting that birds are designed to eat seeds on a daily basis. They just can't be eating fatty seeds every day.
In addition, you absolutely need to find some fresh veggies that she will eat, and keep giving them to her until she starts eating them, because she needs to be eating them every single day. There are a massive TON of fresh veggies and dark, leafy greens that you can try to give her, I mean dozens and dozens of them, and you need to keep trying until you find some that she likes.
*****Now, here's the real problem...You should not be feeding her fruit every day, as all fruit is just filled with sugar, as much sugar as candy is! The reason that she's readily eating fresh fruit and not veggies is because of the sugar. Sure she'll eat fruit, we like ice cream and cookies more than veggies too, but look what happens to us if we eat them every day. Fresh fruit is quite often though of by bird owners as being the SAME as fresh veggies, like an either-or situation, and this is one of the reasons that so many pet birds die so young or suffer their entire lives with conditions like Fatty Liver Disease, Diabetes, Arthritis due to being overweight, etc. And the larger Amazons have a tendency to put on weight quickly and suffer from severe arthritis in their joints due to being overweight. Also, Amazons also have a tendency to develop a lot of very large Lipoma's all over their bodies, which are simply fatty tumors due to them eating too much sugar and fat. So you need to start replacing the fresh fruit with fresh veggies every single day, and only give her fresh fruit 3-4 times a week, and in small portions so that these things don't start happening to her. If you take away the fruit as a regular part of her diet, she'll be much more open to eating some fresh veggies daily, as well as adding a healthy, low-fat and non-sunflower seed-mix to her diet daily. There are a lot of really great seed-mixes that are low-fat and very healthy for them, like Roudybush for one...
***As far as fresh veggies to try, you can start your list by trying all of the Squashes (Butternut, Acorn, Spaghetti, Yellow, etc.), Eggplant (my guys love eggplant), of course Green Beans, Sugar Snap Peas and Sweet Peas in the pods (these are usually favorites), any of the Bell Peppers (Green, Red, Orange, Yellow) or other Peppers, as birds love Peppers and have no receptors for the heat they emit, Sweet Potatoes (she'll probably love these because they are sweeter), Carrots, Broccoli, Cauliflower, Okra (my Senegal loves Okra), and any other fresh veggies you can find EXCEPT for Onions/Leeks, as they are toxic to birds.
***Dark, leafy greens that you can give them fresh and that are just as good as the "veggies" include Bok Choy and Pak Choy (they usually really like Bok Choy), Swiss Chard, Arugula/Rocket (they usually love Arugula because it is peppery tasting), Mustard Greens, Turnip Greens, Collard Greens, Dandelion Greens, Kale (occasionally), Spinach (occasionally), any of the Romaine lettuces, and basically any other dark, leafy greens...Never feed any Iceburg lettuce or any other "watery" lettuces, as they have little to no nutritional value and are all water.
That should give you a good place to start. Luckily fresh veggies and greens are very cheap to buy, and there are just so many of them. They really tend to love the "meaty" veggies, of course the sweeter veggies, and then the peppers.
And you can either look in the Food/Diet forum here or Google search for different veggie "Chop" recipes, which are really great because you can make them in very large batches and then put a day's portion in baggies, freeze the baggies, and then just take out one baggie at night or first thing in the morning and put it in the fridge to thaw. That way you're only making-up the Chop's once a week, maybe less depending on how much you make.
