Thanks @ucbalumnus and @“aunt bea”. She did attend all of her high school years in California, so hopefully that will be all that’s needed to maintain the in-state status. I have emails out to a few schools. UCSC did reply to say that as long as she stays in California, keeps her CA driver’s license and voter registration here and doesn’t establish residency elsewhere, she will be in-state. Not sure if the CSUs will be the same or not. Hopefully it will be as easy as it sounds!