I realize that girls who want to play in college have to do a lot of the work themselves (reach out to coaches, attend camps, Hudl pages, etc.), but do girls really get discovered at 16U or 18U college exposure tournaments? Any idea what % of girls are "discovered"?
Is a college exposure tournament the same as a college showcase? My DD has had a very good experience at Atlanta Legacy, IDT in CO, Champions in Atlanta, and Scenic City in Chattanooga.
The top pitcher on DD's team was 'discovered' by a Big Ten team that she later committed to. The coach was there to watch another team, and she shut that team down. One thing led to another. I've also seen college coaches ask TB coaches if they have certain types of players they might be looking for (ie, 'Who is your best student? Would she like to learn about the Ivy League?' Or 'I can give a full ride, would anybody be willing to go to North Dakota?)
So I think it happens, but Riseball is right that you should not view showcases as discovery opportunities. They are mainly opportunities for coaches you already know to watch you play.