I cant believe doctors are still using the gigantic brace thing. I tore mine in August 2013 and never had it. My ortho used the button technique with plastic screw to hold in place on the top. Started moving it almost immediately per doctors orders. Couldn't lift anything heavier then 5 pounds...
First Id say she needs a smaller glove but that's just my personal opinion. No bigger then a 12" glove is necessary on the IF other then 1b. You'll be pretty limited in the 12.5" niche. Going to down to 12 or 12.25" would increase the number of gloves available to you.