Sister had POA and put Dad in an ALF. He died and she was giving his things away and stole everything. Any advice?

We have documentation of all of dads assets. He lived with us for over 10 years, back in the 90's & was close to his grandkids. Our sister was always jealous of the relationship we had with dad. He moved to Gold Country in southern Cali to be a miner. We knew she was the excutive to his living trust because she was the oldest. But since everything was laid out in writing we thought when he passed away it would be fine. In May 2012 we got a call that he was in the hospital basically dying of malnutrition. We raced to SC and was able to share our love and say goodbye. He passed away 5/23/12. The very next day we drive out to his home and a local was driving off with a $5000 trailer. He said he bought it off my sister. It was insane because she was cleaning up the garage barking orders to people and her weird boyfriend was trying to take control of things as well. We didn't have a chance to grieve, it was weird, that she was acting like this. We then heard she goes to Psychic to decide what to do with her life, that explains a lot. Our dad would be so sad to know she is not following his will.
So bottom line, She has taken everything and we have not seen or received anything from my dads estate. . He had a home, motor-home, 2 big trailers, 2 ATV's, gold mining equip, gold, cash, CD's etc. He wasn't rich but had enough. He wanted everything divided 4 ways between his children.Too top it off we have a picture of his check book register where she wrote herself and my sister a check for $5000 a year before he passed away. Then when we got the call about him not doing good and she paid for herself and my other sister ($2000) to travel to his side and I received nothing. I had just lost my job and my home and her greed is sickening!
One last thing, She filed a wrongful death lawsuit against the convel. home SHE put my dad in. She then named myself and 2 other siblings Nominal Defendants so SHE would get everything. That just shows how greedy she is. The case supposably got dropped because the home didn't have insurance.
i can fill out and file forms but I can't afford lawyer. He passed away in Lancaster Cal. and my sister lives in Florida. We live in San Jose, CA We also know she did insurance fraud on some of his belongings. Can some please help me by telling me what forms I need to file to get her to show an accounting of everything and because of her lies and greed she should be removed as executor.
Thank you so much for your help. We are the kind of people to help everyone. We give even if we don't have much to give. I am a Preschool Director and hubby (his son) after 17 years lost his Aerospace Engineer job right when his dad passed away. We both have been youth ministers and always involved in helping all children and youth. We are now raising our 3 grandchildren and getting our share would help our family.