She arrives at 7:00pm and signs up for the 9:00pm slot. Then she leaves.
She returns at 8:45 with her friend. At 9:00 she plays her three songs. Then she packs up her guitar and leaves.
She doesn't hear anyone else play, except the person who played just before her.
She doesn't meet or talk to anyone else there.
I guess the Open Mic Diva thinks that no one else playing could possibly be worth hearing, and definitely not becoming friends with.
Oh well, her loss.