Along with the thrush, I'd be concerned about how she's being trimmed and how her feet are growing.
Even though she was just trimmed a couple of weeks ago, I still see some things that lead me to believe that maybe even your regular farrier isn't doing that great of a job. Of course, I'll hold final judgment until I see some really good pictures, but it looks to me like she might long all the way around and likely has some seriously under-run heels going on.
Can you post some better pictures of her feet from the bottom and also from the side with her standing on a mat/board/concrete?
Here is a guide to show how to take good photos. Good Hoof Photos - How to take Good Hoof Photos