Needing 19 off the final over, Supernovas skipper Harmanpreet (46 not out off 34) almost got her team over the line with some sensational hitting but veteran pacer Jhulan Goswami held her nerve after being smashed for four consecutive boundaries.
In response to Trailblazers' 140 for five, Supernovas ended agonisingly short at 138 for six. Harmanpreet and New Zealander Sophie Devine (32 off 22) took the game deep with a 48-run stand for the fifth wicket.
The game was an ideal advert for women's cricket and before Harmanpreet's cameo, it was explosive opener and Trailblazers skipper Smriti Mandhana who enthralled the Jaipur crowd with a match-winning 90 off 67 balls.
Mandhana took the team to a fighting total after Supernovas opted to field on a slow surface at the Sawai Mansingh Stadium.
Stroke making was tough on a rather slow surface and though 141 seemed like a comfortable target, Supernovas had to work hard for every run. Poor fielding let Trailblazers down but they still managed to get the result they wanted.
After the early fall of New Zealand veteran Suzie Bates, captain Mandhana anchored a 119-run stand with Harleen Deol (36 off 44), who struggled to change gears in challenging conditions.
In fact, both Mandhana and Deol struggled to get going as Trailblazers crawled to 25 for one in six overs after Harmanpreet Kaur-led Supernovas opted to field.