The popular wisdom in high school circles where I live could be summed up as "Don't worry about the girls who are running a lot of mileage and winning right now. College coaches don't want to see a lot of mileage. Sure, they want to see good times, but they want to know there is still room for development once the kid gets on campus." There is also the assumption that high mileage will lead to injury and burn-out. It can, but it doesn't always.
My feeling is that that advice is inadequate. I think college coaches want proven winners. They want their recruited athletes' bios to say things like "state champion" because it makes their program look strong and competitive, and that's how they keep attracting top new recruits. So high school girls do actually have to worry about those high-mileage girls because, plain and simple, they win.
This "don't worry" advice was given to our high school girls when they fretted about the competition who was running 60-75 miles a week in the summer. And guess what? Those high-mileage girls were still recruited by all the top programs in the country, so I guess the coaches didn't care that much about HOW they got so fast. In fact, I won't mention names, but there's a girl we know of with an impressive bio achieved very early on in her running career. After that, she was perpetually injured and never ran a complete high school season. Gossip (based on some fact) chalked her condition up to having run too much, too young. People thought that college coaches wouldn't touch her because of her reputation for being injured a lot. WRONG! She was recruited by some nice Div. 1 schools anyway.
So I repeat my assertion that running low mileage, while it might be better for young girls' health, could also leave them shut out of the winning and therefore shut out of the top Div. 1 programs.