Got a vengeful streak in you?

Okay, I need some help. My stepmother is a terrible witch. It's unbelieveable. Me and her are like on a not-talking-to-each-other thing and we've been ignoring each other for 2 weeks now. We normally have little arguments every so often for the last past 2 years (the amount of time I've been living with my dad and her), but it's becoming really frequent like every week now that I've been showing some courage and standing up to her. But now shes began to do really mean things delibrately. But shes really sly and she when she does stuff like that she does it to where it provides only inconvienances for me so she can have her little laugh and my dad not find out about it. She hasn't done anything serious, just petty little stuff that I'd rather make fun of, but I can't pretend it doesnt bother me. Any suggestions on how to get back at her?