Oh my gosh those poor little girls. Of course she’s waking in the night/ because she’s scared! She sounds like she needs to work on emotional regulation for her and the girls. All that this shutting the door and yelling is creating anxiety and trauma that will cause more problems in the long run. I beg her to read ‘raising a secure child’. It’s all about emotional regulation/circle of security and it has helped me so much (speaking from experience as a highly emotional and anxious child who had parents who would get angry and yell at me in the middle of the night also…. Some brains are just wired differently and need more TLC)