Do you think she likes me? Should I make a move?

ok me and this girl i've had a crush on for awhile used to work at the same place. recently we joined a honor society together, and she begged to go with me to see me get my first tattoo. but lately this past week when we got inducted I had her laughing alot and she asked if I wanted to see a movie with her after but I allready had plans. two weeks later I came into my old work place where she works and she took my order and was kinda flirty. she turned red alot, admired my tan and new muscles. She still wanted to see that movie with me and we set it up. The "date" is tomorrow. How can I find out if she for sure likes me? Should I make a move on her?