(CNN) -- The search continues for a missing University of Utah student.
Mackenzie Lueck hasn't been seen since returning from a family funeral in California.
The last time anyone heard from Mackenzie, was she texted her parents at 1 a.m. Monday to say she had landed safely back in Salt Lake City.
"Not going home to your pets or your roommates or just dropping your luggage off, that's very abnormal,” sorority sister Ashley Fine said. “Not going to work. Having your phone off for five days now, very very bizarre and alarming."
Mackenzie took a Lyft ride from the airport, but police and Lyft say there were no irregularities in the driver’s route, going to the destination entered by the rider.
"Keep an eye out, keep spreading them message,” said sorority sister Rachel Palmer. “Keep putting up posters around. We're just being hopeful right now."
Friends and family are hoping their message helps find Mackenzie, and hoping Mackenzie finds the message that her sisterhood loves her.