Poor Holly. Sounds like she's been through a lot. I know those hoof abscesses can be really nasty. You might want to contact the Gainesville Florida vet school. That's where Flair had to go when he had teeth growing every which way. It turned out to be a very rare case and they photographed his teeth before shipping them to me(no discount on bill, though) Anyway, here's the link: http://www.vetmed.ufl.edu/
Flair ran and bucked like that after he got home from Gainesville. I was riding him one time and he was bucking so much that his tail was hitting me in the head
I hope Holly gets well. I know how much it hurts to have one of your wonderful fur pets sick.