I agree with the advice to get a lawyer.
My sister handled my mom's estate several years ago. I knew how much it was worth and was constantly asking about the little dribbles of money she sent and was constantly told that taxes were being paid, stock was being sold, etc. Finally, after 3 years, she decided it was time to dissolve the trust and distribute the remaining funds. Strange that there was only about $2K left instead of what should have been a whole lot more, closer to hundreds of thousands.
She had a fit when I said I wanted to see an accounting before I signed anything. At the very least, I wanted the bank statements from the trust account. No lawyers or accountants. Just bank statements. I could tell by what she had already sent that she had co-mingled the trust accounts with her own. She had a shit fit after I sent the email telling her that and she died almost instantly, likely from a heart attack. Then my other sister accused me of killing her. (Honestly, if I had that kind of power, I'd get a list together and work on it.)
Turns out that she had used her POA to assign her boyfriend (event though she was still married) as beneficiary to the account holding most of the money. He was a 3-strikes convicted drug dealer who was hiding out at her house.
Seriously, you couldn't write a believable fiction about all the shit that went down with this. I was next in line as trustee, and had to write a letter saying I would absolutely not serve since I would then be responsible for all the shit she pulled. In the end, she didn't get to enjoy it, so I suppose karma got the last word.