You could try luring her out with a treat or make a path of treats going from her cage to you. My rats love Rice Crispies and they can eat alot of them without getting full so you can try it a few times.
Can anyone help me.
I have 6 rats and 5 of them are very friendly with me it's just this one rat that I can not pick up. Even if I put my hand near her she goes for me. I have had rats in the past that have biten but became friendly once they got to know me and trust me. It's hard trying to feed, clean and get her out of the cage. Then once she is out it's trying to get her back in. Please can any of you help me. Lina. 
