possibly - we dont know all the details - but the circumstances enough warrant a severe reaction - a 12 yr old girl or any minor for that matter should not be in the rectory - Its unclear if the girls patrents knew of the circumstances - I doubt they would have allowed it
I remember my Uncle telling the story that when he was a newly ordained Priest back in the 60s he lectured his boss (the Pastor) not to have teenagers do stuff like that.
Fortunately the Pastor was never accused of anything, but after he left one of these kids robbed the rectory.
So it's not only to protect the kids that they should be kept out of the rectory it's also to protect the Priests.
Another example, one guy here in Boston (who was given a HUGE check by the Archdiocese) claimed a Msgr. had molested him in his room, when it was prooven that teenager were never allowed upstairs (plenty of proof that he couldn't have been snuck up there) he was thoroughly exonerated (that combined with the history of the guy making up stuff).
The Archdiocese still gave the guy a big check and the Priest has disappeared....one of the many reasons I don't like our current Cardinal.