Betty Jo Flynn is old, but still a child at heart. Even though she is elderly and old, she is still very athletic, and she is still a great roller-skater. It is possible that she is very competitive ("Crack That Whip").
Betty Jo was part of the rollerskating derby early in her adult life. Her team, the Tri-State Bombers, almost won, but Hildegard Johnson cheated at last minute causing their team to lose. Ever since then, Betty Jo and Hildegard have been enemies.
Ever since they were young, they were enemies. Betty Jo described Hildegard as a "cheater" while Hildegard called her a "loser". Around 50 years later, they instantly recognized each other. They still hated each other, and had two rematches. The first rematch was a tie, while the second is unknown.