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(CNN) They are being remembered as people who "meant so much to so many."

Yvonne Selke and her daughter, Emily, were aboard Germanwings Flight 9525 that crashed Tuesday in the French Alps. They, along with the other 148 people on board that flight, are presumed dead.

"I just keep saying over and over, it's surreal. You always see these things on the news and you think it's horrible, but you never know anyone involved," said Haley Holmes, a close friend of Emily Selke's.

"I think what people need to know about them, and what people should know about them, is that they were two -- not two Americans on a plane, not a mother and daughter on a plane -- but Yvonne and Emily -- two amazing, loving people who left behind friends and family who love and miss them a lot," Holmes told CNN's "Anderson Cooper 360°."

Emily Selke had belonged to Gamma Sigma Sigma's Zeta chapter at Drexel University. She was a membership vice president while at the sorority and "an integral part of our growing chapter," according to the chapter's Facebook page.

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