Legal Question in Wills and Trusts in California

I am sorry for your loss.

A power of attorney expires at the time your sister died. Her partner can no longer assert she has power of attorney.

Have you asked her partner if she left a will or trust? If yes, will she provide a copy to you? If not, do you have any idea what your sister's estate looked like or how much it was worth?

You should consult personally with a probate litigation attorney in the county or town where your sister lived. You may have to file a probate petition to gain access to your sister's records and assets.