The photo was posted back in July and remained on the site for less than 24 hours, but resurfaced last month after being forwarded to school officials by an anonymous source.
While Laraine Cook was terminated by Pocatello High School, her fiancé, who is the school's football coach, received an unspecified reprimand.
"Looking back now, maybe I would say, 'you never know how someone else might take something,'" Cook told Local News 8 in her first sit-down interview since the firing. "If I've learned something from this, I've learned that you just never know and have to be extremely careful about what you do and say."
Cook also said she planned to appeal the school's decision and still holds out hope for returning to her position as coach of the varsity team.