So, an update on Twitter: for the last four days, she has refused to eat any millet unless I'm able to get it into her face. Otherwise, she flies away if I get anywhere near her. I hadn't spent any time with her before Saturday. Does that affect the current situation? Also, the person who I got both Stormy and Twitter from told me that she's willing to give me another bird to replace Stormy as soon as I said that he had passed. Also, I appreciate your thoughts on what might have killed Stormy. I have told everyone that you and I believe that he had a stroke or other heart problem. So, what should I do about Twitter? Why is she behaving this way?

Hi Tyler is Twitter sleeping a lot or puffed up? Is she eating normally otherwise? What are her droppings like?
I would have her checked out by an avian vet to be on the safe side in case she may have picked something up.

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Twitter is behaving that way because she doesn't yet trust you.
It takes time, effort and patience as has been explained previously.

https://talkbudgies.com/training-bond...y-budgies.html
https://talkbudgies.com/introductions...1-hi-guys.html

Spend the time helping her learn to trust you and remember every time you "force" her to do something -- eat or whatever, then you are taking several steps backward in the bonding process.

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She has been eating normally; she isn't acting sick. I second your opinion, FaeryBee.