Hereâ€™s what I know..
Petrified Wood (a.k.a. Fossilized Tree) is great for such a condition. I think you could tape one or more pieces to her leg (of course regular cleaning required).
But, if you want an even faster recovery, you could take two segments of whole fossilized branches, and hold them daily for some time on the two sides of the broken part in a way that the surfaces with the rings face each other, her leg coming in-between. And, the best would be I think if you could tape these pieces there...
I hope she gets better soon!