Wotherspoon was the architect for the goal, finding Stevie May in the box.
"David Wotherspoon has been a dream for us this season as he can play in so many positions - either on the right, in off the left or behind the striker," Wright told Sky Sports News.
"He had a shot by drifting off the left just before he created our goal that was close. I'm really pleased with him and it was a great assist for Stevie, who tucked it away nicely.
"I'm pleased with our night's work. The players showed great character."
St Johnstone are sixth in the league with 29 points.