Your lawyer's answer is correct. If you didn't agree to co-sign for the loan, you can't be held responsible. You do, however, have a fairly difficult road ahead of you to marshall the evidence that you didn't sign on the loan. And unfortunately for you, the person responsible for the fraud is likely "judgment proof" and therefore unable to make you whole for your losses.
I recommend you retain a lawyer to help you sort this out sooner rather than later.
Disclaimer: The answer to your question does not create an attorney-client relationship, and is for informational purposes only. You should consult your attorney for legal advice tailored to your individual circumstances. The answer is not, nor is it intended to be, legal advice.
I will second the advice of the previous post. If you did not actually sign as a cosigner, you have no actual liability; however, you will likely need a lawyer to help you prove that you did not sign. I would also consult with your local police department. If she is prosecuted for fraudulently signing your name, that may be enough to show the holder of the note or a collection agency that you are not a proper party.