Whoa... And Dev liked that comment too.
If that's the case, this is some next level shit. I don't throw words like evil around lightly, but this could fit the bill. Intentionally hurting someone from time to time because you are angry at them is immature, but understandable. However, to perpetrate this kind of subterfuge over this kind of time frame is evil, no two ways about it.
By the way, is it clear that Mam has been in contact with Marie and Milly? I didn't think that what we heard of Milly's conversation with her suggested that. I'll have to go back for another look.