Hannah DeVault's three-run homer was a key hit as Lipscomb overcame a 6-0 deficit.
Plocheck seals the win over the previously unbeaten Panthers with a solo homer in the seventh.
Pittsburgh, ranked No. 19, Troy and Southeastern Louisiana round out the tournament.
Thomas and her teammates enjoyed a successful weekend on the field and a fun visit to an historical city.
Thomas earns second pitching award for the week.