"There was a look in their eyes," Graff said. "You've got to have that look, and they did. They were prepared for battle and they proved it."
The Wildcats (14-9) took advantage of Southern Garrett's cold shooting in the first quarter and grabbed a 10-5 lead after the first eight minutes.
Graff said the key to the quarter was limiting the Rams (15-10) to one shot on most of their possessions.
The teams played even for the middle two quarters - each scored 25 points - and Williamsport took a 35-30 lead into the final eight minutes.
"We got into some foul trouble and they kept it close in those two quarters," Graff said. "But in the fourth quarter, they started to panic. We were able to keep our composure and that was the difference."
Williamsport sealed the win by outscoring Southern Garrett 13-8 in the final quarter.
"We played well," Graff said. "Not just four or five girls, but the whole team. Everybody who was on the floor contributed."
Ashley van Norden and Carrie Weimer scored 13 points to lead Williamsport. Britt Jones had 11.
Weimer grabbed 12 rebounds, Megan Andrews had nine and Jessica Rouse added eight.
The game was the first for Williamsport in nearly two weeks.
"We could have just as easily played badly," Graff said referring to the layoff. "But that time allowed us to get a lot of (injured) people healthy and that was definitely helpful."