[B]Yeah, I think maybe you should go the route as if she is a puppy and start from scratch. You don't know what she was/wasn't allowed to do before hand.
We just rescued Chance two weeks ago and he had been in a kennel that he and all the other dogs were peeing and pooping in so of course when he came into the house the first thing he tried to do was lift his leg and pee on my sofa.
I yelled, he looked at me and has not done it again. I did go and get him a belly band that he does wear when ever he is not in sight but he has not tried to lift his leg inside at all since that day.
I take him out about every 45min. to one hour when I am home and wait outside w/him until he goes.
So far so good. In due time I bet she will get the hang of it and be just like the rest of your gang.
Good luck[
/B]