Hi! I am new to horses, and we recently got a new horse that someone gave me and she was in the pasture for seven years. We have had here for about two months. And I have been working with her in her barrel and pole pattern. I have been taking it slow because I know she is not in shape. Yesterday I noticed she kinda was limping so I got off and picked a rock out of her hoof. Today her ankle is swollen and she limps when she trots with me in her. But when she walks she does not favor it. I put some ice gel stuff on her. Does anybody know what could have happen? And how long could it take to heal? Thanks!