if the issue is sinking deep, you'd just have to be honest, and if possible... proove to her, who your friend is?
let your mother call him, to check him up.
i remember chatting to this chick, years ago, and one time her mother logged on, pretending to be her. i never talked dirty or anything to the girl in the first place, so the conversation went ok, just a bit weird, cus she didnt seem like herself (obviously)
after a couple of minutes, she told me she was the mother, and yay, i had passed the test 
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''In the world I see - you are stalking elk through the damp canyon forests around the ruins of Rockefeller Center.''