I think it's wonderful that your dd has a heart for missions. My two oldest children have both been on several mission trips with a reputable missions group (not involved with our church) and they have had the experiences of a lifetime.
May add, when I say that not all mission organizations are alike. I prefer the one we are involved with because they have a very strict code of conduct and very modest dress code.
Teens are not allowed to "pair off". Meaning no boy/girl relationships. Two friends of the same ... are not permitted to pair off, as to exclude other members of the team.
Teen are not permitted to have tatoos, body piercings, colored hair, mohawks, etc. Boys are not permitted to have a haircut below the ears or down the neck.
No lewd jestures or language permitted. Girls are not permitted to wear tank tops, sleeveless tops, midriffs, halter tops or anything baring any skin. All kids are required to wear jeans or long pants and construction boots for the entire trip. At church services, girls are required to wear skirts below the knee, boys wear slacks and tie.
Teens must follow the strict conduct and dress guidelines at all times. If they fail to comply after several attempts by staff/leaders to correct the situation, the child is sent home at the parents' expense.
The organization does not permit anyone to be a disruption to the team's mission.
It is important to check out each mission organizations' rules of conduct and dress codes.
Praying for you,
Mom to Warner (17); Olivia (15); Isaac (11); Isabella (8)