Ooooooo unless she is going more frequently than normal than I dont think I'd be in any rush to go to the vets just yet. Is she weeing by the door that she would normally scratch? I think I'd be inclined initially to go back to however you trained her in the first place, just go back a step and reward agian. The weather could be a cause... going out there really is too much of a chore and too darn warm.... the weather here today looks decidedly autumnal, if not wintery. Good luck x