She earned medals (3 gold, 1 silver & 2 bronze) in 4 Olympics (84, 88, 92 & 96).

3 of those medals were in the Heptathlon (84 Silver, 88 & 92 Gold).

3 of her medals were in the Long Jump (88 Gold, 92 & 96 Bronze).

Current world records

As of August 2016, Joyner-Kersee holds the world record in heptathlon along with the top six all-time best results whilst her long jump record of 7.49 m is second on the long jump all-time list. In addition to heptathlon and long jump, she was a world class athlete in 100 m hurdles and 200 meters being as of June 2006 in top 60 all time in those events.

Sports Illustrated voted her the greatest female athlete of the 20th century.

Personal bests
100 metres hurdles : 12.61 s
Long jump : 7.49 m (still currently #2 all time, 3 cm behind the world record and she did it twice)
High jump : 1.93 m
200 m : 22.30 s
Shot put : 16.84 m
Javelin throw : 50.12 m
800 m : 2 min 8.51 s

https://en.wikipedia.org/wiki/Jackie_Joyner-Kersee