The striker grabbed the only goal of the game just before half-time, expertly lifting the ball over the onrushing Helen Alderson in the Durham goal.
It proved enough to stretch Yeovil’s unbeaten league run to five games and Knapman admits the third-placed Lady Glovers have Doncaster Rovers Belles and Reading firmly in their sights.
"The three points were massive,” she said. “We're still third in the league, so we've got to keep the pressure on the top two, Donnie and Reading.
“We came here wanting three points and nothing else and we would've been really disappointed to leave with anything other than that.
“They didn't make it easy for us at all, but we too made it difficult. We weren't very clinical in front of goal. We created a lot of chances, but didn't take as many as we could have.
“However, we managed to get the win and that's all that matters, as well as what I think was a good solid performance.”
After twice missing headed chances Knapman raced on to Natalie Haigh’s through ball to put Yeovil ahead on 43 minutes.
While Durham struggled to trouble their visitor’s goal at the other end Stephanie Williams volleyed onto the bar from 40 yards just after the hour mark.
Knapman and Bow Jackson both missed from close range for Yeovil in the final ten minutes, before a stoppage time strike from Alys Hinchcliffe was saved well by Alderson.
Next up for Yeovil Town Ladies is Everton Ladies on Sunday at Huish Park. Buy tickets by clicking here.