She's flirted with all of them!
Before Nicole entered she was all over Rex.
And her little conversations with Mikey! "What color do you think my eyes are?" "Oh, I want to be next to Mikey!" "Mikey, those ___ look really good on you!"
Dale? "You are like seriously really good looking!" "You are HOT, Dale! Have more confidence in yourself!"
Yep, sounds like flirting to me!