Any way you can post a video? The vitamins will help with muscle support but if this is an injury that can take time to heal. I’d limit her access to a lot of movement until you see much improvement. Again examine her leg from hip down to bottom of her foot for excess heat redness swelling. Water exercise is good just don’t let her jump in or out of the pool.
So I examined the little one legs, and I did notice that the right leg is lighter than the other does that mean anything? But I didn’t see anything alarming, no scratches, swelling, no bruising, no anything