Cheryl Watson was Greta Gerwig’s high-school theater teacher and the current St. Francis Catholic High School performing and visual-arts chair.
After the Golden Globes - where Lady Bird won an award - Watson sent her former student a congratulatory e-mail.
The film is nominated for 5 awards at Sunday's Academy Awards.
St. Francis High is also planning a "Lady Bird"-themed soiree. On the Facebook event page, the school encourages attendees to dress in thrift-store attire. Thrift Town, where the film’s protagonist shops with her mother in the film, is offering 50% vintage dresses through Oscar Sunday.
The gym plans to serve popcorn, sliders and ice cream from Gunther’s - another local spot that makes a cameo in the film.