Is your mare turned out much of the time or in a stall? Does she have more of a "natural pasture" (varied terrain, including rocks and hardpacked dirt or more of a flat, grassy pasture)? These factors CAN PLAY a big part in the ultimate decision to shoe or not...How badly did she founder 30 days before you got her? Rotation of the coffin. Bone? I agree that hooves are VERY COMPLICATED to learn,
anatomy and physiology speaking (@ least for ME, AND I spend a LOT OF TIME TRYING!!)...I feel your confusion!
I'll read your answers and offer the small advice I have...some things have less to do with your horses feet and more with her living situation and schedule/feed/etc...thus SOME ?'s CAN be initially begun to be addressed via internet forum...those unrelated to HER MEDICAL ISSUES, @ least!
Best to you! B2H. :0)