Lima does not have a subway.

To the OP: If this group has experience in Lima I think it will be a good experience. What I found intimidating in Lima the first time was that the scenery was a drastic change from what we are used to in the USA. Disrespectful drivers, panhandlers, and just the sight of poverty are some examples. If your child knows what to expect she may get over the initial culture shock quickly and end up having a great time.

True, there are some areas of Lima that even I don't venture to. I am sure the group would avoid them as well.

Otherwise your daughter will most likely find that the Peruvian people are warm and friendly and will probably appreciate the experience of knowing her just as much as she will appreciate her time there.

By the way... July 2008 is winter there.