looking for my adoptee sister

I am looking for Tia Mary Keen, born 7/4/82 to Terri Raylene Keen (Robinson, or Hoyle). Born in Rocksprings Wyoming. You may know (or know of) an Emily Siegler or Zoeann Underwood, or Arlene Roberts. You may have been adopted in Wy or New Mexico. I am your half sister and Know where our birthmom is. contact me at jodrennen@yahoo.com if you have any information. Thanks!