Unauthorized mortgage is a kind of the action of enacting the mortgage on other peoples property, which includes the actions of signingcontract and performing contract.
无权抵押是无权处分人以他人财产设定抵押的行为，该行为分为签订抵押合同的行为和履行抵押合同的行为。
2
She's hesitant about signing the contract.
她对是否签这个合同还犹豫不决。
《牛津词典》
3
Nothing comes to mind right now, but I'd like to go over all the articles of the contract once more before signing it.