Rescued Dog Started Peeing Inside?

I have a rescued Pit Bull who is about 1 yr old. When I first got her she would poo in the house. Fine, we got her on a better food, she had stomach issues because she didn't have shots, got that all situated. We are a month passed that. I've never had issue with her peeing on anything in the house. Now she pees on beds that are on the floor, including her own, never when we are awake or home. We normally kennel her when we are gone more than an hour which is rare; there is usually someone home. The second we leave she peed on it. Now she's doing it at night. We just recently started leaving her out of the kennel at night. I'd like her to have the run of the house and help protect the house at night. I'm just not sure what to do.