She is not tied down. There are the three in the room, yes.
You know for a fact that Davena is a spellcaster with some power. The other two are apparently priests; whether they also have spells is not clear. Remember that in Audalis, you'll have many clergy that cannot cast spells, that act as priests or reverends or pastors in the real world - they teach, they pray, etc, but they cannot perform "miracles" like clerics can.
Of course, they absolutely could be clerics, as well; the odds of overpowering or rushing past three spellcasters are... not great.