Honestly, many people do party and party hard all year long. I went on the program when I was 19/20 so underage for Florida. And most of my co workers were 21+.
It is such a large group that she will be able to find others that share her interests. But she might want to consider waiting a bit past just turning 18 as for sure she would be the youngest. I worked with people who were 25, 26, 27 etc.