She will not be penalized for taking additional classes. There are three UC GPAs: unweighted, weighted capped, and weighted uncapped. The UCs see all three of these GPAs, and you can expect that the more selective UCs will place more emphasis on the weighted uncapped.
Note that many CA high schools have seven or eight class periods in the day, so it’s not just IB students that take a lot of classes. And ambitious students also frequently add community college or other classes outside of the regular school day. So a higher number of classes is perfectly normal and the UCs see it all the time.