Well, first investigate. If she has been in this situation before, court records of old cases are generally public record. If and when you do get to court on this, make sure that that information is brought to the Judge`s attention. You may find that she has done this repeated times and each time, she gets a slap on the wrist or gets off all together because no one has brought up that she is a repeat offender of this type of practice. To point this out only works to your favor because it makes her look like a con artist and not someone who made a mistake.
I will try to talk to some attorney friends of mine and see if they have any advice for you as well.
Whatever you do, don`t give her a free ride on her mistake. There is no telling how many people that she is doing the same thing to. If fact, if you find out that she has jacked around other clients in or close to the same manor that she had with you, you then could join forces and file a class action suit. With this, the judge could have her business license revoked and order her to shut down her company and could possibly even force a settlement to be paid through the liquidation of her company.