It’s not what I meant by social development. Yes, some people do that in college, some don’t do it much, if at all. But there are other aspects of personal growth associated with the college experience that I think are benefited from having a similar age to your peers. And there are obviously different ways to develop after high school, college is just one.
I’m sure this young woman will be fine. But it’s not how I would have developed best, and that’s probably true for many others (but obviously not all).