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Her name is Jessica Barnhill. She is a Private Process Server certified by the Supreme Court of Texas. You can find her address and phone number on the list of Private Process Servers here:
http://www.txcourts.gov/psrb/docs/Statewide_Authorized_Servers.htm
And here: http://www.courts.state.tx.us/psrb/docs/Statewide_Authorized_Servers_12.10.13_0830AM.xlsx
And Facebook: https://www.facebook.com/jess.barnhill.5
BEWARE of her if she comes knocking on the door!! She is there to serve you with lawsuit papers! She drives a grey mustang with a TX license plate of Bcv5894. She has come by our house twice now, on a Friday and then again on Monday. She will leave a plain piece of paper with her number and hours to call back.
From snooping on her Facebook (people, this is why you should keep your FB private) it looks like she bounces in between Houston and San Antonio because she goes to school at UTSA and goes to Houston when she's not in school.
Just don't answer you door, don't call her, don't sign for any certified mail that the post office might bring you. Whoever is trying to sue you can't really go through with it unless you get served with papers officially and that's what her job is.