The level of play in both public and private schools in the MD, DC, VA area can vary a whole lot. Usually, it's not that high. Top 40 Mid-Atlantic juniors would destroy most of the high school players. The exception is the few juniors that play for their high schools.
I wonder how she got that good. I thought that the president had the tennis courts at the White House taken out and turned into basketball courts. At least that is what I remember reading in an article about the history of tennis at the White House.
I would think the Tennis Center at College Park would be the best place for her to practice.
I wish her the best. It can only be a good thing for the sport of tennis.