I can only speak from puppy training which I just did. I suppose it couldn't hurt to just start from square one with her.
I was taking him out every 15-20 minutes for weeks. I kid you not. I set an alarm and out we went. Every time he woke and cried at night too. Your dog has the bladder capacity so I'd maybe try every hour.
I used the same phrase every single time "Let's get busy" (in retrospect, I'd have picked something less annoying had I know I was going to say it 8 kabillion times a day
). Anyway.. anytime we were in the house he was on his leash, on the end of my arm. If I went anywhere, he walked there with me. There was no opportunity to sneak off and pee because I could see his very very subtle signs. It trained us together. Big thanks to DS for the leash tip because prior to that I was losing my mind taking him out only to have him pee the second I turned my back in the house.
Then when we were out.. no other interaction but "Get busy Charlie Brown" and then a huge dancing, squealing praise party when he did. So much affection that I looked like a lunatic. No really.. an absolute lunatic.
It worked. He gets it. And we haven't had an accident in about a month and a half with a five and a half month old dog. However, the classical conditioning went a little too far because now he won't "get busy" without an audience. Preferably me. 
Seriously. You send him out and he waits and cries until I come out and then he pees.
Anyway.. I think if you just go back to basics and retrain her you'll have the best results. 
. I also don't go for harsh training methods. Reward the behaviour you want consistently and you get great results.
