I'm scared to tell a dog owner, I no longer wish to sit their dog incase she reviews me badly. How do I tell her politely no?

A few months ago, I watched an older foster dog who at the time was a bit of a handful, but we managed to get through the stay with no major issues. (She had bladder control problems, and pee'd almost all over my house)

The owner thought she did so well with me, that she booked me again about two weeks later. This time however, things got out of hand, and I tried my best to maintain a safe environment for her dog. The dog escaped twice, which no dog, not even my own has done before. She broke a screen to my window, ate the molding to my door, even chewed and made a whole in a wire fence (which was one of the ways she got out of a "dog run").

Now, the owner has not reviewed me for either stay, but has now requested, even though we told her of the damage her dog caused the last time, to watch her again for another week. I am hesitant to explain to her, that I no longer feel her dog is a good fit in my home, for fear that she will leave me a bad review, though I've done nothing wrong.

I see that Rover does not remove reviews very often, and am scared that it is going to reflect poorly on my profile. What should I do? How do I tell the owner I can not watch her dog, without her getting upset.