No one at the hospital knew how to help Ryuuko, however, Aikurou stepped forward. Aikurou, I should note, is someone our father had known, yet we didn't know, actually, we don't recall meeting him and, apparently, he's our father's cousin. While he is off in some regards, he did very much want to help her, even if he didn't know how or know us personally.
From his observations, he said, "If I didn't know any better, I would say her age can't be very far from Nui's and she might have been living like that since her formative years, if her lack of speech is a clue. She knows language, however, it seems she just can't use it in syntaxes, thus making up her own. She moves around on all fours, likely because her leg bones and spine may have some abnormalities or the development might be stunted in them, on top of being made to live in a cage, which in turn didn't allow for her move around very much. Fortunately, she doesn't seem to be too particularly far from recovery, however, she'll remain stunted in some areas of her development but not all."
As we observed her, she turned to us and made something of a gesture. While we couldn't understand it, it was clear she was trying to communicate with us, getting frustrated when it seemed we weren't paying attention. In her frustration, she made more gestures and became verbal, saying, "Ahnt." It was utterance, yet it was clear that she was expressing that she wanted something. While that was the case, what she wanted was something we didn't know, to which Aikurou said, "She probably wants her sisters."
Gently, he ushered us closer to her, prompting her to cease her gesturing and reach her hand out. Her groping fingers made way for the braid in my hair, clasping it in a light grasp, as she lightly fingered it. She made eye contact with me as she did it, only breaking it when she repeated the action with Nui. Once she was finished with her interactions with us, she opted to curl up and look at us.
"Some of her memories might still be intact, as she seems to recognize you. If not, she may recognize that you mean no harm to her. Oddly, the same cannot be said about how she felt about the doctors, considering that she had bitten one, scratched another, and almost injured herself trying to get away from them." he reasoned.
Affectionately, he opted to call her "Princess", a word she curiously repeated, asking, "P'incess?" Rehabilitation for her would be long, yet she needed help, however, she did have much to work with but she would still remain stunted.
When Nui stated I shouldn't have contacted the authorities, Aikurou was quick to defend, saying, "Well, in all due fairness, Nui, contacting the authorities is really the only way Princess could receive help as what is the matter is beyond your scope of reasoning and Satsuki was only emancipated and received custody of you fairly recently, roughly a week or two ago. Of course, you've just gotten to know her a little and has already lost most your family at this point, so your concerns and upsets are reasonable."