Actually as I read it, it was at set point to the loser ( of that point and the match ) in the second set tiebreaker when she was 11 - 10. up.
Vicki Nelson took that point though and the subsequent two points ( well, after she'd recovered from collapsing with cramp and getting a time-violation warning ) to beat Jean Hepner : 6 - 4 7 - 6 (11)