Does she like younger kids? She could do the babysitting thing. When my kids were really little I used to hire the girl across the street from us to be a mother's helper 3 mornings a week in the summer. It was great all the way around.
Or, you could help her find a job at a day camp, or even at a resident camp if she is over 16. They don't usually pay much, if at all, but they are often looking for enthusiastic counselors and aides. It's a fun way to spend the summer outdoors and being active.
~ I used to be undecided, but now I'm not so sure ~ Boscoe Pertwee