The 47 year old has been working her way through the minor leagues for 8 years, and will work games in the Grapefruit League this Spring.
https://www.espn.com/mlb/story/_/id/39513548/jen-pawol-one-call-away-being-first-mlb-umpire
https://www.espn.com/mlb/story/_/id/39513548/jen-pawol-one-call-away-being-first-mlb-umpire