So. Harry Dresden vs his greatest weakness: A child, and a female one at that. I never approved much of his, very conscious, bias for those categories. Always seemed wilfully irrational and arbitrary. This - feels like karma. It is a good feeling.
Of course, why he hasn't latched on to the part where Tanya comes from another world, and as such is an Outsider, might have something to do with that, as well as his first contact with such an Outsider being a woman. Still, the other wizards will have a definite interest in such information. I expect Harry to want to keep this conflict away from the attentions of the White Council for this reason.
I hope to see interactions between Tanya and the local believers and servants of God/Being X. At least a quick trip to a certain church for her usual maintenance of focus and hate.