The 33-year-old woman entered the plea Monday in Salt Lake City to two counts of sexual exploitation of a minor.
She had also been facing two first-degree felony counts of aggravated sex abuse of a child and life in prison if convicted. Prosecutors agreed to drop those charges in exchange for her plea.
She now faces up to 30 years in prison at sentencing Dec. 5.
Authorities say she used a cell phone to send the photos to a man to whom she was trying to sell the girl's virginity for $10,000.
The Associated Press isn't naming her to avoid identifying her daughter.