First, it’s normal for teenage girls to separate from their moms by deciding mom is stupid. I didn’t become smart again until my middle child (daughter become my trans son) was in his twenties.
That being said - the abrupt nature of this does make me consider other possible causes:
Is there a boy she likes who lives near H?
Is she getting away with something at H’s she can’t do at home? (Drugs or sex come to mind)
Is your ex or his wife badmouthing you to daughter?
Or - and this will sound far fetched but hear me out - has Covid messed with her brain? Long Covid patients often develop mood issues with out of the blue anxiety or depression. Not as likely as the other things, but possible, since Covid can spread to the brain or cause vasculitis that affects the brain.
