Kid unable to use back legs, help!

Hi, I’m new here and have been reading through previous posts on this topic but mines a little different than ones I’ve read.
I am a large animal Vet Tech and acquired a Boer Doeling from a client, to give her a chance at a normal life.
She is unable to move her back legs and has been like that since birth. She was a Triplett, all 3 very small. She came out at 1.5lbs. Other siblings are normal just small & she is different. I’m thinking she was squished in the womb & wasn’t able to fully extend and kick her legs?
The tendons are very constricted giving her a “splay leg” or “swimmers leg” posture. She has received BO-SE, Thiamine & Nutridrench. Radiographs showed skeletally she is normal. She has no muscle mass in the back legs. So daily I have been massaging them, she’s had a few water therapies (not sure if those work in goats like it does dogs but can’t hurt/might help right? 🤷🏻‍♀️) & I work on those tendons and try to help them loosen up. I try to create normal leg movements for her to help build up that muscle mass & memory. We built her a little stand so she can lay “normally” for a few hours throughout the day. After 4 days I have been able to get them less constricted than they were, but still no movement. She can feel them when pinched. But still hasn’t moved them at all. Curious if anyone else has had a similar situation and was able to turn one around? I’m willing to put in the time & work that she needs if she has a chance.
She’s the sweetest baby & otherwise normal, small, but normal. Eats well, has normal bowel movements & urinates normally.
Her front legs are normal, a little “lax” but she can stand on them with help.
Any advice is appreciated, support is also appreciated, im trying to stay realistic with the situation but it’s hard not to get attached when you are literally tending to them like an infant.
First 2 photos are from the day I got her last photo in the diaper are from today 💜
She’s a fighter, which makes this situation hard.