I think calling a parent "helicopter parent" is insulting. The OP doesn't know the school staff well or the parents who will be in charge on the trip. Should she just trust them just because it's a fun trip? How is she supposed to know how this group will handle the situation if there is a problem? We can all say- it will be fine, let her go, but I have been on trips that did not go fine. As a young teacher, I was part of a field trip for 2,3, and 4th graders that was 5 hrs ways. I insisted that my students had a parent or the parents coordinated for a parent who was going to be in charge of their child. Most had a 1:1 ratio or 1:2 ratio. I had one parent who supervied 3 kids. The 2nd grade teacher did not and was 1:8. On the way home, one of the buses blew an engine- flames and a lot of smoke, but no immediate danger. So here we were on the side of the rode with 2 bus fulls of kids/adults and only on working bus. We ferried the kids to the nearest exit (by a McD's and a hotel) and had to wait 4 hours for another bus to come. My kids were safe and fed, but the 2nd grade teacher had real problems keep up with all those kids and not enough adults. We got home at 1am to a parking lot full of a lot of very worried parents who said their kids were never going on another trip without them. My students were fine, but sleepy.
I'm not trying to scare anyone, but my students and their parents knew me well and could trust me to handle unusual situations- not so mch with the other teacher.
OP- spend the next few months getting to know the school staff and parents who will be going. Then make your decision. If they are people who will handle you child well in a not so smooth situation, then let the child go.