Wings President Greg Bibb said Owusu applied for another year of NCAA eligibilty.
"This was home, and this is where I needed to be. I wanted to be the first from my family to attend and graduate from the school that has been such a big part of our lives."
Niederhauser was the Nittany Lions' first portal commit from the current cycle.
Owusu was the first Lady Lion drafted since Maggie Lucas in 2014.
Lambert-Smith was absent from the Nittany Lions' Blue-White Game despite being listed on the roster.
The shirt went on sale on Sunday, April 14.