Try forced socialization. Keep her on you for 20 full minutes. Don't let her leave your body. You don't have to be actually holding her in your hands during that time, she can do whatever as long as she's touching you or your clothes. No rat can stay terrified that long, so if you do that a few times she'll realize you're not a threat. Good luck with them both. 
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Kadee Sedtal
"I wish I had a dollar for every time I spent a dollar, because then, yahoo! I'd have all my money back." -Jack Handey