Pope Augustus!
It was very likely this bastard's doing.
After all, with Augustus' status in place, the barrier wouldn't be able to stop him, nor would the Holy Knight Order dare to, Augustus could wander freely within the Church Court, which priest or nun would dare to object?
This guy had ample opportunity to commit the crime.
Moreover, Augustus was stronger than her, it was only natural that he could break her Magic Restriction.
This guy had the capability to commit the crime.
Most importantly, Augustus had once promised Angelica that he would reinvestigate the curse incident during the Holy Daughter selection, making Angelica the next Holy Daughter.
Her term as the Holy Daughter hadn't yet come to an end, to make Angelica the Holy Daughter, they would have to remove her from this position. However, unless the incumbent Holy Daughter made a serious mistake, the Holy Daughter couldn't be replaced at will, even by the Pope.