She's looking good Little fatty, LoL. I wouldn't worry about the cracks. It is common when it goes from wet to dry and also when the horse hadn't been reshod in awhile(or shod at all). Are you planning on putting shoes on her or just getting her trimmed so she can go around barefoot?

If you want to keep her feet looking good, that Absorbine Hooflex stuff works great. http://www.absorbine.com/animal/prod...flx_liquid.htm You can wash her feet of, dry them with a towel, and then apply that stuff all over her hoof(the outside, the frog, the sole, etc). If you live near a PetsMart that has a State Line Tack store in it, then you will be set But Tractor Supply will have all of that too.

Good luck with the training. Are you planning on attending the sessions with her? Because if the horse is trained, but the human isn't, you will both get confuzzled