What about volunteer work at one of your community centers, churches, nursing home or something like that?
Do you attend a church? If so plug in to the events they have planned which usually include summer camp, vacation bible school and sometimes movies/skating etc....if you don't attend a church, then maybe there is one locally that you could ask about and plug her in there....
Usually there are summer camps or summer programs for kids like crafts/martial arts/pottery,cooking etc...in the our kids magazine that you pick up at the grocery store....
If none of this sounds good, do you have a friend w/ younger kid(s) that you could work something out w/ that she could be a helper/assistant around the house to your friend and maybe get paid a little money on the side? she wouldn't have the full responsibility of babysitting, but would be kind of like an apprentice....Or what about parents w/ a child her age that you could work something out with?
hope some of this helps...
V. Maldonado