If she signed your name without your knowledge or consent it constitutes forgery. You would need to contact the local police as well as your bank and file a report.
DISCLAIMER: This answer given is for general information purposes only. No attorney-client relationship exists or is intended. If you have additional questions concerning this matter you may feel free to contact me at the Law Offices of Jacob J. Linhart, P.A., (561) 632-6982 or Jacob@LinhartLaw.com.