Yikes. I don't know anything about mastitis really. We've never had experience with it. But I wouldn't drink any of her milk till you're sure. Try massaging her udder with some oil, it may ease up a bit.
Started her on penicillin and used Today mastitis treatment. Hoping it works. Maybell is my first doe and have had her for three years. Ever since she was a baby. Want her well, she is my 4 legged kid!!