Messages

My ex disappeared with my daughter aprox. 3 weeks ago. I have been frantically trying to contact her via telephone & txt messages, with no response. She is unstable & I am deeply concerned for my daughters well being! Her parents & siblings are also very worried and have no idea where she is. They have been trying to contact her for weeks, with no response. Aprox a week ago, my sister sent her a txt msg asking her where my daughter is & she got a response from my ex's cell phone but it only said that they were fine & that they were not missing. It said that she has been in contact w/ me this entire time (which is a lie) & that I know where she & my daughter are, (lie) and that I was completely fine with it. (lie) So my sister replied, asking again, where they were. She then received a msg that said she would call my sister "in a little while" to explain. She never did. Today I filed for emergency custody and I have an ex parte hearing set for Monday (12/15/2014). The paperwork says that I need to serve my ex before the ex parte hearing. How can I serve someone if I don't know where they are?