In 1746 she went to the convent in Liege where her sister was already a nun. She was committed to a religious life and was said to have taken a vow of chastity when she was ten. The convent in Liege had been founded in 1642 by an English woman Dame Susan Hawley (Mother Mary of the Conception) who became the first prioress in 1656. Dennett was to young in 1746 to commit to becoming a nun so she was sent to gain an education at the school in Liege belonging to the Ursuline nuns.
