Can't really help unless you tell more. That's like saying "There was this HB9 and I tried to open her, but it didn't work. What did I do wrong?" What is this about finding out if she's crazy? What is the story (if its too long to write out here that I'll get bored, then its gonna be even worse in the field unless you've already gotten her pretty drawn in)?

Is this the girl killed her sister story?

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Im thinking the dead sister routine. It could be a shit test if she's just busting your balls by not answering, in which case you bust her on it. "Hey, I don't care if your psycho, Im not psycho-killer crazy, but I'm out there sometimes. Ask me about my last sky-dive sometime." (or whatever routine you got for crazyness.)

But remember, not everything is a shit-test. These girls may have the same insecurities as you or I have. Sometimes made worse because they may not have good buds to work 'em out with. She might just not want to demonstrate to you in "are you psycho? test" that yea, she's slightly insaine, even in a joking way. Keep the busts light and plow through.

Hope that helps,
Gary