She hasn't taken the MSF yet?! Well, there's one problem.
Try these boots, they are for riding and will give her about an inch extra inseam:
http://www.helimot.com/catalog/boots...tar_data.shtml
Yes, they are expensive, but extremely good quality and hopefully if that's the only thing you need to buy to make it where she's a bit more stable and can enjoy riding more, then it's definitely worth it!
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I could skydive from the moon
Sail an ocean... on my fingertips
When the wind screams my name