The fact that the bird is plucking at all, in any way and in any area, is a sign that something is wrong, this should be obvious. You said yourself that she has been plucking her legs FOR WEEKS! Now I'm not at all trying to be critical or nasty, but if one of my birds was plucking a particular area bald for up to one week I'd have them to their avian vet yesterday! That's not said as a catch-all or for lack of anything constructive to say to you, that's said BECAUSE NO ONE HERE IS AN AVIAN VET, NEITHER ARE YOU, WE ALL KNOW SOMETHING IS WRONG WITH YOUR BIRD, WE DON'T EVEN HAVE PHOTOS OF YOUR BIRD SHOWING HER PLUCKING, SO TELLING YOU TO GET HER TO HER AVIAN VET IMMEDIATELY IS THE CORRECT AND RESPONSIBLE ANSWER FOR US TO GIVE TO YOU!
That being said, I can tell you that the fact that your bird has been plucking around her legs and now also around her vent (birds have no anus btw) has nothing to do with her possibly laying an egg for the first time, not at all. It has to do with #1 her being irritated or in pain in that particular area from either a parasite, rash, infection, follicle problem, injury, etc., or #2 it's plucking caused by a behavioural or psychological problem and this is just the area she has decided to pluck from the stress. I'm going to go with #1, as any time I've seen a bird pluck around their legs, vent, and preen gland it's been a serious infection or skin irritation, and I've seen this more than a few times. KEEP IN MIND THAT BIRDS PLUCK OUT FEATHERS BECAUSE THEY ARE TRYING TO GET TO THE PAIN THEY ARE HAVING AND STOP IT.
I would not let this go any longer, my guess is that your poor bird is in a great deal of discomfort at this point, and has been for weeks as you've admitted. Please get her to her avian vet immediately, like tomorrow morning. Whatever is causing her irritation is only going to keep spreading until you have a huge problem, a huge vet bill, or much worse.
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