I did and still do think it was/is a song about her early encounter (in high school, Atherton High) with Lindsey Buckingham.
BTW, if these two people (especially Lindsey) hadn't joined Fleetwood Mac...FWM would just be a small foot note in RR history today.
FWM went after Lindsey and were told that Lindsey and Stevie were a 'package/couple', both or none.