Asking a girl's friend about her...is it right?

Girl A-Girl I like

Girl B-Her best friend

Now please don't say I'm "going behind her back". These two are best friends. I told girl B I wanted to see Girl A over break when asked about my Christmas break plans. She said "lol tell her! I'm sure she would."

Girl B said if I had any questions about Girl A I should feel free to ask. I said I feel like asking any questions would work against me. She said "Nooooo"

Is it okay to talk to Girl B about it? I don't want to mess anything up.
Asking a girl's friend about her...is it right?
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