RIght now my gelding is barefoot and having a difficult time. He has to wear shoes in the front with heal cocks and flat in the back. If shoeing is what caused the problem then there could be a good chance that barefoot can help her. If you don't plan on riding then that may be the best thing you can do for her. All you can do is try and see and see what your farrier says.
I happen to believe that any horse can go barefoot if given the time to heal from whatever damage the shoes have done. Shoes are a medieval invention, designed to keep horses hooves from falling apart when the castle was underseige and they were stuck in wet mushy stalls for weeks
I also think the Strasser trim isn't horrible. I think, though, it only works on horses who already have good barefoot feet. My horses have been trimmed by someone trained in the Strasser method for years, although she's changed it a little bit so that it's gentler. Their feet are great, even if I don't have them timmed for 6 months, they're fine.