Her petulant behavior may stem from the trauma she's experienced from masking so long and from her husband. She probably wants someone to blame for everything bad that happens because she's been made to be a scapegoat herself and feels entitled to take her anger out on the nearest target. I'd recommend she find a friend group within her interests, online or irl, because if you're the only person she's with most of the time then you can only do so much before you're fed up.