My mom died. I'm the trustee. Do I have to have my siblings signatures?

5 years ago when my mom was first diagnosed with dementia, she and I went to an attorney and had a trust drawn up. Essentially, she gave me her cabin and her brokerage account and I renamed everything to the family trust with me as the trustee. In essence, I am both the "grantor" and the "trustee" of the trust. At first my sister wanted nothing to do with it, then she convinced my mother I had stolen all her money and had her sue me and several others for a large sum of money. All the suit did was drain my mom of about $20,000 in legal fees. My mom came to live with my husband and I and was happy and very well cared for until she died in her sleep a couple of months ago. My sister visited every 6 months or so for about 15 minutes. Sometimes she would call on the phone and verbally abuse my mom-- till I would hang up on her. She is a very troubled, hateful person. My brother soaked my parents for so much money that he does not inherit. So. My problem is that now that my mom is dead I have a cabin to sell and the estate to settle. My mom died with $700 in her bank account and her personal property. Her will has me as executrix. My sister refuses to sign a paper saying I can probate the estate, so this will end up costing more than what is in her bank account.

As for the Trust, It has some cash left to be divided between me and my sister, and the cabin. About 2 years ago I had the trust amended so if my sister causes me any more grief after my mothers death, I can pull out the amendment and take the cabin. She has been horrible to me after mom died. She has accused me of "hiding" something... of being a thief. Same old stuff. She has not gotten any better, but decidedly worse. Now she refuses to sign anything. The question here is, since the trust is my trust-- as both the grantor and trustee-- do I need her signature to transfer title of the cabin to me?