She would actually have to blackmail you for it to be extortion, i.e., threaten to go to the police if you don't comply.
If she just gets pissed off and goes to the police to punish you, without having first threatened to do so, then it is not extortion. It is just a crime report.
If she just gets pissed off and goes to the police to punish you, without having first threatened to do so, then it is not extortion. It is just a crime report.