MacEachern is joining the alma mater of her brother, Connor.
While Tinsley's speed isn't jumping off the page, scouts seem impressed with his ability to haul in passes.
Dorsey will join his brother, Gabe, with the Tribe.
After a win against Johns Hopkins, the men moved to No. 5, while the women dropped to No. 18.
Reedy made his debut for the club on the same day that his signing was announced.
The Nittany Lions' win snapped a three-game skid behind the hot bat of second baseman Kyle Hannon.