Final answer:
The cult of Isis placed importance on dreams, and in some sanctuaries dream interpretation was practiced. It is possible that St. Agnes received a specific calling through dreams.
Step-by-step explanation:
The information provided indicates that in the cult of Isis, dreams were considered an important aspect. In some sanctuaries of Egyptian gods, such as in Athens and Delos, incubation and dream interpretation were practiced. Pausanias mentions that in Tithorea, only those who had been summoned by Isis in a dream were allowed into her temple. This suggests that St. Agnes, as part of the cult of Isis, may have received a specific calling through dreams.