Well, there's this exchange:
I took it as they're called just to standby there rather than for their specialty."...More importantly, do you know the details of your mission? Since we were the ones summoned, does it means I can look forward to it?"
In other words, the Virgin Mary is asking if she is able to have a feast.
"Unfortunately, no. We came here to hunt vampires, basically. Unless something exceptional happens, we have nothing to do. However..."