Thanks again everyone.
One amazing thing about this little bird is that even though she came to us completely abused, underweight from only being fed free bread from a local food pantry, covered in feces, etc. The very night we brought her home she knew we were helping her. As she got her first ever bath in the sink, she seemed to enjoy the feeling and even closed her eyes as if to say that the warm water felt so good as we gently removed all the filth. She did not try to resist or become scared, even though she was wild and no one had ever handled her gently.
Fast forward through a few happy winter months we could give her, and when she became ill and stayed inside, she would sit on or in her cage, and go inside of it if she was feeling cold. She would not wander around, even if we left the room. What's more interesting is that when I attempted to help her, she really tried to accept it. If I offered her some food she would wanly peck at it, just to please me even if she didn't eat. I'm convinced she knew we were trying to save her, and she was an amazing little patient. I learned a lot about how kindness and caring can truly be understood by these supposedly stupid little creatures.
I am now in a weird way missing my everyday routine which had my little Daisy sitting right next to my computer desk. I especially miss her cute little "beeping" sounds and penguin-like wattle.
In the end I think she either died from ingesting some plastic left from former tenants, died from some underlying disease that she carried from the "farm" she came from, or, since she had only recently started laying had some reproductive issue that had no outward signs.
Here's a video of her having a good time just days before she fell ill. I'm so glad I took the time to film her once.