Oh my...Did you adopt this bird of your own volition? I love my Too, but I just hope you are prepared for a much more complicated life...Not all bad, but definitely can get that way without the proper knowledge to deal with them.
It sounds like things are off to a good start. I am glad she appears to be adjusting well.
Non-negotiables for all bird-owners:
1. No more cooking with teflon/ptfe/pfoa or fluroplastics...it hides in places outside of the kitchen (curling irons, ironing board covers, irons, space heaters, heat lamps, straighteners, humidifiers, blowdryers)... You will need to call the company anytime you get something that heats up because many internal components contain Teflon (it can be a clear coat, mixed with other metals or a visible coating---you will not always be able to SEE it though, so you must check-- provide abbreviations (PTFE, PFOA), full chemical names (Polytetra...blah blah), and brand names -e.g., Teflon). Expect to be told that they will have to call you back. This is very important, as birds have died on separate floors when owners used Teflon. It off-gasses and kills them QUICKLY...no cure...In the kitchen, sources are often waffle irons, pots/pans, cookie sheets/cake pans, air poppers, air fryers, rice cookers, steamers, microwave popcorn bags, bake-in-a-bag meals, self- cleaning ovens, roasting pans, slow cookers, drip trays, toasters, toaster ovens etc..
2. You must also stop using traditional cleaners and scented products. No candles (scented or unscented), essential oils, nail polish, nail polish remover, perfumes, aerosols, paints, markers, stains, carpet cleaners, bleach, windex, lysol, scrubbing bubbles, fabreeze, smoke of any kind, vaping, air fresheners etc. Birds have EXTREMELY sensitive respiratory systems and their lungs can literally hemorrhage from exposure. I recommend f10 sc (the yellow kind)- this cleaner disinfects like bleach and is safe to use around birds at the appropriate dilutions (UNLIKE other cleaners). Your other options will be white vinegar + water (as long as you DON'T heat it up---that releases fumes), grapefruit seed extract+ water or other avain safe cleaners. Some of the natural cleaners are safe, but NOT THE SCENTED ONES. Research like crazy....Oh-- and no car air-freshener (tags or other! )
3. Get your bird to a CAV (certified Avian Vet) and get a cbc (blood-work) and a gram stain. This is an important baseline for any bird.
Now...you got a Cockatoo...
I am actually feeling a bit overwhelmed by your post because, sadly, Umbrella and Moloccun Cockatoos are the most re-homed bird species in the world? There is a reason for that. PLEASE DO NOT RE-HOME HER WHEN THINGS GET DIFFICULT- It is so very hard on these birds and it happens all the time (at 10, mine has had 3 previous owners).... They are VERY difficult to own (even for experienced bird owners), but since she is yours now, I am sure that you will be fully committed to doing whatever it takes to keep her happy, healthy and behaviorally well-adjusted. I love mine dearly, and she cracks me up but she is a massive pain in the butt all of the time.
There is a ton to know and since you have never owed a bird, I am concerned, but eager to help. It is VERY GOOD that you are reaching out. Without experience (even with experience) a lot can go wrong. That is why I need to think...
I am likely going to have to type you a novel and come back to this....BUT-
I need to understand what your current setup is and how the bird came to live with you.
If you can answer my 50 questions below (lol) I can provide you with more information (I know it's a lot..again, there is a lot to know):
Do you know about how birds hide illness/ signs to look out for?
What about safe/unsafe foods?
How long have you had him/her?
What is the cage situation?
How long is he/she out of her cage daily?
What is the bedtime routine (do you cover, where does she sleep, is it quiet and how many hours)?
What do you feed her?
How often do you change food/water/liners?
Do you own a non-ionizing/non-ozone producing air filter?
Are you noticing any screaming etc?
How often is she physically touching you/riding on you throughout the day?
What kinds of toys does she have?
What is your living situation and where is her cage positioned in relation to the rest of the household and daily bustle?
When you pet her, where do you touch her?
Do you allow her to climb around inside of boxes/under covers etc?
Do you own other pets (namely, cats)?
Do you own a humidity monitor?
What do you do well do if she bites?
Are you aware that birds can contract and/or carry/spread disease asymptomatically, and that feather dust, poop, dander etc can all transmit these diseases? They can be spread via air, on toys and clothes etc--This will be huge if you ever have to board your bird, want to set up play-dates with other birds, or even if buying toys from a shop that sells birds.
Do you know that liver issues are common and that rapid beak growth is a sign of liver issues? On a related note, do NOT let a vet use an electric file to grind her beak! Only hand-files..In terms of liver health, look out for giving anything super fatty and do not give too much protein.
Peanuts also carry a fungus that is dangerous for birds to inhale, so they should be avoided...as should sunflower seeds (due to fat content and addictive nature).