Can you legally contest the POA? Try to get it revoked since she's is making verbal threats and wants to make it so you and your husband never get to see each other again? Plus she screwing around with not using the money to pay all the bills for your home like she's supposed to be doing?

Do you have a bank account that's yours alone she can't touch?

Do you have any relatives from your family, not your husband's you can talk to about all this?