Sorry but 99% of 7th grade girls have no business playing varsity. I don't care how talented they are, they just don't have the physical development to hang with girls who are 3-5 years older. Is this story true, probably but I would also bet this thread was started by some jealous parent. Did these 7th graders earn their spot, doubtful, did someone cut a deal or call in a favor, most likely. Will they benefit from practicing with varsity players, most definitely. Will they be impact players doubtful even if the schools program is so weak.
You are 100% correct that 99% of 7th graders do not have any business playing varsity. Let's do the math. There are 125 school districts in Nassau and Suffolk. Lets say 10 kids from each 7th grade play lacrosse, that gives you 1250 7th graders playing lax this year. Lets say 5 get brought up to varsity. That is .4% That means you were actually a little low. You should have said that 99.6% of 7th graders have no business playing varsity.
