When she talks about him putting his hand out of the suitcase, she makes it really clear that she didn’t want him to get out after their fun little game. I don’t know if she was too drunk to realize he could die or not. But she clearly didn’t want him out. And then I think she just passed out.
They both sound like a couple of violence-prone drunks and I do believe he abused her. But I also believe she abused him. In any case, the proper course of action with an abuser is not to suffocate them to death while taunting them. And I don’t give her a pass due to her very obvious intoxication. She’s guilty.