A reasonable question.  I think the answer is yes, for several reasons, some of which are as follows:
1.  The coaches and program care where players are ranked.  When Kussow officially signs something with the Gophers, the U’s press release will highlight her ESPN ranking, or perhaps cherry-pick a higher ranking from another ranker.
2.  With earlier female maturation, the rankings are much more predictive than they are on the boy’s side.  Centers/Bigs may be an exception and harder to predict.  But when you look back at USA Basketball U-16 teams, for example, it is stunning to see how prescient USA Basketball has been at identifying the top players.
3.  Related to #2, rankings/scholarship offers/McDonald’s All American status help set expectations for players and teams.  For example, you can’t win a national championship without multiple McDonald’s All Americans.
4.  Rankings/scholarship offers tell you a lot about a coach as a recruiter, in multiple ways.  Can a coach snag elite recruits with blue blood offers?  Can a coach out evaluate their peers? (Coach P’s recruitment of Grace G and Tori M say yes to the second question).  When Coach P snags her first McDonald’s AA player, it will be a big deal.
5.  Ranking trends can be meaningful.  Alexia Smith was ranked early in high school as a five-star recruit.  By the end of her senior year, she had fallen to # 68 by ESPN.  The Gophers stupidly trumpeted her as a five-star recruit, adding unnecessary hype to a limited player who would never live up to that hype.