She netted her 44th goal in 15 Division 3 appearances as champions Havant & Waterlooville drew 2-2 with Gosport Borough at Westleigh Park.
The stalemate - the first time Hawks had dropped league points all season - brought the curtain down on a double-winning campaign.
Hawks had beaten divisional rivals Bursledon at AFC Totton FC the previous week to lift the Hampshire Women’s League Junior Cup.
Butterworth’s second half leveller against Boro ensured she finished the season having scored in every one of her league games.
Her superb total included a double-hat-trick, three lots of five goals, one four-goal haul and three trebles.
Hawks entered the game knowing they had already won the title, as third-placed Boro had lost the Gosport derby 4-2 to Falcons a few days earlier.
Chloe Dark was also on target for Hawks, with Jodie Goodall and Megan Gratton scoring for Boro.
Boro could still finish runners-up, but need to win their final game - the rematch against Falcons - on May 21 to do so. Falcons only need to avoid defeat to finish second.
9. Chloe Dark scores Hawks' opener
Chloe Dark scores Hawks' opener. Picture by Dave Haines Photo: -
10. Chloe Dark has just scored Hawks' opener
Chloe Dark has just scored Hawks' opener. Picture by Dave Haines Photo: -
11. Hawks' Bre Seach on the ball
Hawks' Bre Seach on the ball. Picture by Dave Haines Photo: -
12. Hawks' Jodie Burchell, right, with Boro's Lauren Hickmott
Hawks' Jodie Burchell, right, with Boro's Lauren Hickmott. Picture by Dave Haines Photo: -