A power of attorney is no longer valid as of the date of death.
If she is the co-owner of any bank account, the assets are now legally hers and do not pass to a trust. If you believe these accounts were created for convenience, you have the right to contest the passing of these assets in court.
If there is an adversarial relationship, I was suggest that you hire an probate/trust attorney who can best represent your interests as a beneficiary of your father's estate.
Answered on Feb 13th, 2012 at 1:17 PM