>> reporter: the stars at night were big and bright. but by dawn, deep in the heart of texas there was no trace of christina morris. >> i didn't sleep for 24 hours. i stayed up all night. >> reporter: by wednesday morning, four days after christina vanished from the fancy shopping center, her mom jonni was growing frantic. >> i called every police department. i called every hospital because you never know. >> reporter: the calls led nowhere, and jonni felt helpless in oklahoma, so she and her husband packed their bags and drove the four hours down to plano. straight to the parking garage where christina's car had been found. >> you came straight here. >> yes. >> even though this was the one place in dallas where you can pretty much guarantee police had searched pretty thoroughly. >> yes. >> but you're searching. you're walking all over the place. >> yes. as a mom, i just couldn't