My understanding is that none of the summer programs is going to help stand out for college more than any other productive activity (a job, for instance regarded highly). The only exception would be the handful of very competitive, very prestigious, mostly math-based programs. Or perhaps some of the highly competitive programs in music (National Youth Orchestra).
As for Rosetta, my understanding is that she will do lab work and classroom work and also have a lot of peer/group activity with the other students.
@hebegebe and @Chekov — are you the posters who are experts about the prestigious summer programs that help with college admissions?