I would agree that Jill's troubles coincided with the demise of school figures. She had trouble with them early in her career, but by the 1989 and 1990 seasons she had mastered them and did well in that that phase of the competition. Unfortunately for her it was around that time figures werer being eliminated. When Jill competed against Midori in 1989 and 1990, the events followed a similar pattern: Jill took a big lead in the figures and then tried to "hold on" as Midori went into overdrive in the free skate.
Jill's most difficult jump was a 3flip, which was impressive in the school figures era, but not when other skaters were doing 3lutz, 3axel and 3/3 combinations. Still, Jill had good speed, artistry and strong programs. Her nerves tended to get the better of her, though.
Jill was a very beautiful woman, one of the prettiest elite skaters to ever take the ice IMO.