Olivia was not injured last year. Ever since she ran 2:10 to win the NJ Group 4 800m as a freshman we knew she could run a lot faster if she needed to. We just didn't know how much faster. She has always tended to run to her competition because she was often running multiple races at each meet. Her goal was to conserve her energy so she ran only what she needed to run in order to win.
With respect to Stanford as her choice, I am pretty sure the results the new coaching staff (formerly of Georgetown University) had with Cory Carter played heavily into the decision from a track and field standpoint. However, I do know that Stanford's academic reputation was first and foremost in her decision.
By the way, among young female runners, there has been persistent scuttlebutt about rampant eating disorders at Villanova, and Oregon has been viewed as a job, i.e. you are an athlete who, incidentally, attends classes. Oregon has also been criticized as a factory that chews up new athletes and spits them out, with an "only the strong survive" over-the-top regimen.
FYI... Coach Morgan, Olivia's high school coach, has figured it out: The key to significant improvements is not running kids into the ground. The base Olivia and her Columbia HS teammates run on is fairly light, not high mileage, so they tend to make it easily through post season competitions, well into July, without burning out.