My ex called me and told me i was to be in court on friday cause she is sue me?:
If you have a lawyer, notify him or her right away.  If you don't have a lawyer, get one.

You should contact the court to determine if a hearing is actually set for Friday.  Even though you might not have been served with papers, it would not be a good idea to ignore this situation as others have suggested.  

For you all you, your ex might have gotten someone to falsify a proof of service to show that you were properly served.  You might have to request a continuance and properly prepare for the hearing.  If there is a hearing and you don't show up, the court might make and adverse ruling against you that could be difficult to undo.