Should i go see her again?

Here's the story: One of my friend's female buddies have been hanging with us for several months now, and i've been spending alot of time flirting with her (mutually). Anyways, the other day I visited her while she was at work, and it got really busy so I handed her my phone number to grab lunch later, and she seemed really excited. That was four days ago. She hasn't called (which people say girls don't call guys...), so I'm going to visit her again. The question is when should i go without looking desperate. It's been five days.