Success stories on housebreaking an adult dog?

Many of you know we just got a dog from the rescue. We were told she is housebroken. She is not. We have had 3 accidents; yesterday’s was pee all over the kitchen tile 30 minutes before people were descending upon my house for a Tupperware party. This was within 5 minutes of being inside after being outside for a couple of hours.

It ran down the grout lines under the wood trim. My husband has pulled up the trim and I have cleaned and cleaned. I have used enzyme cleaner multiple times and even bleach (on the tile side, not the hardwood floor) and it is still there.

My friends and the internet have so many different theories and I don’t know which one to use. I know this is different than training a puppy because Roxy has had over a year of going wherever she wants since she was never really inside.

I am looking for personal testimonies of methods that have worked in similar situations.