Speaking as someone whose notion of beauty has never really progressed past 1991, the blonde highlights of Cindy's hair were concentrated around the front, giving the impression of lightness, but most of the hair was left brunette.
In the attached shot, you can see the blonde only runs through the front of the hair, at the top and sides, but this small amount of highlighting was very versatile, because in a side-part, it framed her face, and when it was brushed back over her head, it gave the impression of more blond hair than there really was.
If you consider Cindy's colouring, she needed to retain a lot of the brunette for the blonde to look natural, and while this actually is an easy enough look to recreate at home, the best effect comes from concentrating the lightener about an inch or so away from the hairline, then applying a thinner layer above that, so that the colour of the highlight becomes graduated between the blonde and the natural colour emerging from your hairline.
(operagloves.com)