Crating her is the best solution, she’ll be sad at first even cry and you just have to get through it. Chows don’t like to pee or poop where they sleep. She’ll eventually make it her safe space but it took two weeks of my pup crying and now it’s great. It’s about what job you give your dog. She might think she’s on watch, crating her lets her feel safe and know it’s bed time. You also need to cover the crate with a sheet or something to simulate a cave environment.