I'm reminded of Paarthurnax from Skyrim who asks you whether it's more moral to be an innately good person to whom altruism comes naturally, or to be born with strong selfish traits but to overcome those in the pursuit of good.
I'd guess that for Ponchina's host she'd still be considered Good in the end, although maybe not if she'd had the opportunity to help her vampire commit atrocities with suggestions and ideas.