her buddy steven nickerson called her to be sure she was okay. >> i said, "hey, have you made it to your and she said, "no, almost there." >> reporter: a few minutes later, steven texted christina, but the messages were coming up green on his screen. which means her phone is not on? >> or out of service, yes. >> reporter: steven slept it off, and drove home late saturday morning. >> i shot her a text and say, you know, let me know if -- when you get home, whenever your phone charges or whatever it is. >> reporter: three days later on tuesday afternoon, christina's mom, jonni, now living up in tulsa, oklahoma, got a text from one of christina's friends. >> asking me have i heard from christina. and i said, "no. why?" and she sent me back a message. she goes, "her boss called me and said she never showed up for work." >> reporter: she hadn't shown for her shifts on saturday or tuesday. >> i immediately got a feeling in my stomach that i've never had before. i knew something was wrong. i sent christina a message on her phone. and i sent hunter a message. >> reporter: hunter, christina's liv