[WA and CA] My sister moved to California but has been using my address in Washington State for a number of different legal documents. What should I do? Can I get in trouble for this?

So my sister moved to Southern California when my parents retired down there. She was 20 at the time and lived at home while going to school. It has come to my attention she has been using my address to pay in state tuition at school (she goes online). She has registered her car to my address to avoid California environmental tests and fees I guess. Not sure the specifics. She just renewed her drive license to my address. I'm not sure if she's used my address for anything else but she is basically claiming to live at my house when she actually lives >1,000 miles away.

Can she get in trouble for this? Can I?