Watkin took 3-45 from her eight overs, with the other wickets spread around four more bowlers.
On Wednesday, it was Mitchell who was the Hinds anchor when Grant and Watkin had gone early, with Mitchell scoring 83 from 124 balls including a six and 11 boundaries.
Mitchell had the key partnership with Anlo van Deventer, who scored 80, to guide the Hinds to 246-5 after 50 overs.
But again, the Blaze ran then down, reaching 247-9 at the end of the 49th over.
Watkin took 3-47 from her ten overs, as well as taking a catch and getting a quick thrown into Rangi for a run out, but Wellington's final pair were able to put on 22 runs to win the game.
The Hinds will next play the Canterbury Magicians in a Twenty20 game at Hagley Oval in Christchurch on Monday.