Should I Call Her...?

So, there is this girl I like and we seem to get along great. I'll catch her looking at me from across the room/halls, she'll ask me for help, she'll smile at me, invite me to events, mimic my gestures, cross her legs a couple times while sitting next to me, and she will preen herself when I'm around. About two days ago she asked for my phone and put in her number and said if I ever needed a ride to church I should call her. Well, I'm not sure if I should just call her to get a ride if I ever need one, or just call her and say,"Hey, what's up?"