I am I liable to continue to pay for a linen contract if my business no longer exists.

First read the contract and see if there is any kind of provision to let her out of the contract. Probably not, in which case if she personally signed the contract then she obligated herself personally, even if the building was sold and the contract was executed in another state. Much like a person who signs an auto loan and has to keep paying the loan company even if the car is totalled and he has no insurance.