How old is she? Go back to basics with her. Taking her out every hal hour and staying out and waiing until she goes, whatever the weather. Praise her when she is done. Ignore any messes in the house, just clean it up with biological washing powder. It is important you go out with her and not just leave her to it because she'll spend more time trying to get back in with you than going out to go to the toilet.

Peace
Akai-Chan