If she applies to many of the California schools, she could be rejected at a lot of places because it doesn’t sound like there’s a lot of rigor in her schedule.
The California public schools won’t be cheap. $72 to $75K per year. They are extremely competitive in GPA and rigor.
If she doesn’t stay and increase her rigor at her high school, her chances will be slim for California schools.
The private schools will be even more in costs. She needs a budget.