I've had loads of students get the "specially selected" letters. When they ask me about it, I say if they are interested to look into it, but it's no different than the trips that I plan in the end, and with me they travel with someone they know and trust, and their friends who come along as well. Being as I'm a foreign language teacher, I actually plan trips to Europe for my students and I've got 11 going with me this spring. I've got my own rules, and my students need to be B students, no truancies, at least in language level 2, etc...I don't take students I don't know personally, nor those who have not been in my class, or ones from whom I get bad vibes.
It's a great experience, but honestly I think P2P is super expensive for what you get. The trip I am taking my students on is 13 days and only 2200...and they stay with a host family for part of the time in France to practice their language skills and compare/contrast American/French life. My students last year even got to check out a French high school, and with the exception of their stellar cafeteria, and different daily schedule, all came back with a renewed positive feeling about American education (meaning that the teachers aren't mean and don't humiliate them in front of the class like in France).
Maybe see if your daughter's future HS offers anything that might be a little less pricey and more geared towards FL learning? Just an idea.