Mother in law

Elijah • Female, 19 years old. Been with my SO for 2 years. And I'm struggling!
Me and my mother in law used to be quite close. But now I feel like there's friction between us and I'm not sure why. I'm supposed to be moving in with her while me and my SO save a deposit on our own place. But I'm just wondering if anyone else has similar problems or can give me advice on handling it without being confrontational????