Tuition at Berkeley will run you $65K per year.
As for summer classes, you MUST check with UCB before she signs up for anything.
She won’t be able to take many classes, to defray a lot of your costs, because the CC’s (in California) typically run for two summer sessions and courses generally are lengthy and usually run M-F. In other words, if she takes a bio class, for session one, it will probably run 4 hours. The lab will run another 3-4 hours. The speed of the courses will be a good primer for Berkeley’s courses.