Unfortunately this concept is lost on most people. Your players did not get recruited because of D9 attendance numbers. They got recruited because they worked the process. The number of coaches and teams attending is a moot point. What matters is if the coaches you have contacted are attending.
Absolutely true. It's pretty rare (almost unheard of) that a coach just wanders over and targets a player without prior contact. But...if the girls do their work, the coaches will show up. The nice thing about D9 is that there are many, many coaches there, and unlike most of the showcases in our area, there might be 20+ schools attending that a player is interested in. So the odds increase.
Long story short, if your daughter's credentials are good, the skills video is sharp, and the email/letters catch the attention of the right coaches, it's a great place to be seen. If not...well, it's a nice long (expensive) weekend in Florida.