How old is Tia?
A lot of puppies have setbacks. We have always done pretty well, because they didn't get much freedom at all until they were trustworthy. Coby is 1 year old and still doesn't have free reign of the house. He has two huge rooms and two stairways. All other rooms are 100% supervised visits. But at the first sign of setbacks, we would simply back up in training.
There was a time for Coby that at potty time (when I "know" it's potty time - like just getting up in the mornng) we actually had to use a little pen around his potty pad. He wanted to play instead of potty. He HAD to stay there until he pottied. Then there was much hoopla and he got to get out. That was actually the time he learned the "go potty" command.
I would suggest you just back up. Then as things start to get better start increasing the freedom again.
It takes a lot of patience. But if you can devote a few weeks/months to the process, you'll have years of stress free living!!
Good luck. And lets see if we can get you some more ideas!