I had problems with meddling and recurring wrist injuries for a while...what I was told by many orthopedists is that most wrist braces are designed to prevent your hand from being forced straight back. If that was the mechanism of her previous injury then a wrist brace might help, but it's gonna be tough to find one that's actually supportive in all directions. If I wore mine on my bike it wouldn't do a thing.

FWIW I have a full brace with thumbie for skiing...like I said, it wouldn't help a thing.

I think she'll find more benefit in trying to raise her bars so more weight is on the saddle.