First & foremost, get your learning cap on & go to hoofrehab.com & safergrass.org for starters, then learn all you can from other sources. You will find that there is very much you can do to rehabilitate her & avoid future problems.
Diet is a big factor, and as with humans with diabetes, if a horse develops insuline resistance or cushings, for eg, their diet will likely have to be managed for life, not just if they're fat or some such. Laminitis is the inflammation & subsequent damage & weakening or separation of the laminae which connect hoof wall to coffin bone. This appears to be caused by metabolic(diet, insuline, etc) problems.
Proper hoofcare & good management are also vital to hoof health, whether rehabilitating or keeping them sound. I suggest finding a good hoof care practitioner and keeping the horse out of shoes, but booted if necessary for comfort, to enable her to get exercise & good hoof function.