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I'm not entirely sure I would tell google I had 'enemies' from the offline world that would launch click attacks against me.. Might be seen as shady, and signaling that they'd forever have to deal with special stuff concerning your account. Then again, maybe they'd appreciate the honesty.
One more thing: have you ever logged into your adsense account, or visited a site running adsense from her IP? Your adsense cookie is probably connected with both your publisher account, your ip and her ip. So since your account is connected to her IP, even though she has a different cookie you may have a tough time convincing them it wasn't you who clicked... If this is the case, tell them about your GF and hope for the best, but apply for YPN..
Good luck :)