She later gave birth to a daughter.
But Berks County District Attorney John T. Adams says his office won't press charges against the Rev. Luis A. Bonilla Margarito because the relationship started when the girl was 18.
A spokesman says the Diocese of Allentown began putting paperwork together over the weekend for the process known as removal from the clerical state - popularly known as defrocking. The diocesan spokesman, Matt Kerr, says the final decision is up to the Vatican.
Last week, the girl's parents filed a lawsuit saying Bonilla carried on a sexual relationship with the girl while he was the chaplain of Reading Central Catholic High School and she was a senior there.