It is potentially an invaluable move for a Maungakaramea side which has struggled to find a winning grove this season.
Thorne added that while it is good to have Gunson back, no one can say his side has won the match before it has been played as the coach expects it to be a tight one.
"When it comes down to finals, no one has won the game until the final whistle. You have to go in with the mental status of putting in the effort, because if they want it more than you they'll take it.
"The biggest thing with the girls is you don't get a second chance next week, [but] in a way, as far as your mental standing goes, knowing you have to win gives them a lot of motivation.
"I've got faith they'll make the final."
All other premier women's teams have this weekend off, with the winner of the Girls' High v Maungakaramea clash to join the top three women's teams in next weekend's semifinals.