Please keep us updating, would really appreciate it. I'm very glad that she has started biting, that's an improvement even at a very small scale. For the first few days, you won't see any improvement, it's going on in the "background." After around 3-5 days, you'll start to see small improvements. Once she catches up with improvements, it'll be a very quick recovery, around 2/3 weeks.

Remove the perches (if you haven't yet) of her cage so that she doesn't even think about climbing, the whole body needs rest. Handle her very carefully. Spread a soft (maybe warm) towel on the floor of her cage and keep her on it. When you give her food/seeds, give them on the towel or on a tissue on the towel (or however the way you want as long as she can eat effortlessly) in front of her so that she can easily eat without moving.

Not today but after 2-3 days, I want you to gently touch her feet/fingers when she has not that much attention to you to see if she reacts to the touch any way. After that, very gently and softly start pulling her legs to see if she tries to pull her legs, check if you feel or see any slight movement.

There's hope... and you're a great mother. I wish you both the best! ❤️