She was the first woman to ever officiate a college football bowl game.
She already made history in 2015, when Thomas became the first full-time female officiant in the league.
When the Chargers face off against the Patriots on Sunday, it will be a history-making event, according to ABC 13.
Additionally, replay official Terri Valentini, who was hired by the National Football League in 2017, has been assigned to Saturday afternoon's game between the Kansas City Chiefs and Indianapolis Colts at Arrowhead Stadium.
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Sunday will mark the third playoff showdown between Patriots quarterback Tom Brady and his Chargers' counterpart Philip Rivers. She's spent the last two seasons as a down judge, before previously working as a line judge.
Thomas, who is listed as a sales representative from the University of Mobile in Alabama, will be part of crew for Ron Torbert, a referee she commonly works with.
Thomas says she wants to focus on "being the best official I can be".