Sellman had 219 kills in 20 matches as a freshman this season.
The Nittany Lions received 90 votes last week.
Rec Hall has played a huge role in helping out the Nittany Lions make the semifinals of the NCAA Tournament this season.
This win sends the Nittany Lions to the semifinals for the first time since 2017.
The Lady Lions dropped their final non-conference game of the year 68-65 to Kansas on Sunday afternoon.
The top two seeds will meet Sunday night for a spot in the semifinals.