Livin' my life on the farm

Horse Experts!! HELP!!

Ok my dear Rue has been hobbling around for nearly 3 weeks now and have NO idea what is wrong with her. I had her trimmed about 3 weeks ago the Cobb, the fella who trims her hoofs, said her hoof was a little sore, she didn't want to stand on it when he was trimming, but there wasn't any puntcher wounds or anything so it would be fine.  She seemed to get better in just a few days which was good! I went on a 4 day trip with my dad then went camping for the weekend with some friends. I peeked out in the pasture at her yesterday when I got back and she seemed fine. Grazing away.  This morning Tonno, our miscivious pony, pushed open the gate and they were wandering around the front yard eating grass. Rue I noticed was walking horribly. She won't even put weight on her foot. I was leading her in to their area and she hearly ripped my sholder out of joint when she walked! She'll step only on the good foot. She to move she completly stands on her back feet and then lunges forward on her good front foot. I cleaned her hoof and there is nothing in it. It's not hot like it's infected or anything. I'm thinking it's more in her joint. It's more swollen between her hoof and her ankle then on her other leg. But I don't know what to do for that.  I'll try to post pictures of her hoof, right now it's not letting me. *arg*

Kate