How can I tame my new guinea pig!?

I've had her for 3 days, and when ever I walk by her cage she runs and hides in her igloo! It's a workout to pick her up, and she squirms so much, it's hard to scoop her up without grabbing a little. I fed her some lettuce(romaine) and a red bell pepper today, and put sone parsley in her cage, which she is nibbling at now, but I want her to wheek when I bring in food, or open her food bag, and to run up to the cage and be excited when I walk into my room! Any tips??