Allessie is a former All-American and All-Big Ten honoree.
Jack Posey and Kevin Parnham were key contributors on last year's team that reached the NCAA semifinal.
The Nittany Lions mercy-ruled Fairleigh Dickinson in a 4,902 program-record attendance.
The redshirt junior ranks fifth in Lady Lion program history in career steals.
The Nittany Lions have scored 69 runs in their last seven contests.
Timely home runs sprinkled throughout the series gave the Nittany Lions their third straight Big Ten series.