OKAY i'm sorry for this delayed response but basically maggie is very method herself, known for throwing herself into a role completely and having a lot of exhaustion and addictive tendencies that go along with that. with hereditary specifically, she would have been fresh off of her joyce byers frantic 'why won't you believe me?!' hysteria that she would have made a conscious effort to tone down for this film. so while she gives it one thousand percent when the camera is rolling, she wouldn't need a whole lot of coaching and instead just turns it on. during their one on ones she would have come with a whole slew of notes ready for him and be ready to dive right into it. but there's a switch that she can flip so when it's play time with the rest of them, she's right there on board, encouraging everyone out to lighten up and hit up the local spots in town for a massive darts tournament or beer pong in dive bars. and with ~lightman being demanding of his time, maggie would have completely been understanding and encouraging to even help whatever way she could as well.