Thought #1. Anytime a teenage woman doesn't PR in a given year, I get VERY, VERY worried. Actually I probably get worried if it's male or female but very worried if it's a woman, and that was certainly the case this year.
Here are a couple of examples of our very best runners who didn't PR every year in high school:
Shelby Houlihan (11th): Didn't PR in any event
Jenny Barringer (12th grade): Didn't PR in any event and didn't come within 15 seconds of her 3200 PR
Those are the first two progressions I looked at. To ease your extreme worry, maybe your forum regulars can help out with some other examples.