Well, remember, this is the same Celia that thought humans of the Prime could generate electricity (to break / activate her pendant).
I have the feeling she has very little real-world knowledge. Also, I think she knows very little of the Prime. Also, she has spent much of her life in the plane of air &/or the celestial realm, so it seems that she tends to accept people on face-value, because up until then most she met were good or nearly so.
Her naivete will no doubt cause all sorts of problems. I have the feeling that the cleric might be a sham or perhaps merely raises them as undead zombies - and yet will still take all Celia has even for that little bit.
I do wonder, however, how Belkar will die, as I expect he will finally meet his end somewhere in this city.