Teacher's Disappearance Baffles Friends, Family

"Her very close friend called me in a panic and let me know what was happening. We were waiting to hear that the police were officially launching an investigation so I sent the e-mail yesterday," said Caldwell, who attended college with Upp. "She was always super sweet and super welcoming. She was pretty much the nicest person you'd ever want to know."

Hannah Upp, 23, was last seen a week ago.

(Courtesy NYPD)

Upp's outgoing nature makes her disappearance even more baffling to her friends and family.

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"I refuse to believe that she would run away without taking [her purse or clothes] with her. There's not clothing missing that would suggest she had packed for a trip," Wood said. "None of it makes any sense, which is so weird."

Despite the confusion, Upp's friends and family remain determined to find their friend.

"What we're trying to do is get the word out to as many people as possible to see if anyone can provide a missing piece," Wood said.