I wonder, f I/she cure herself. Will the bugg go off?
It shouldn't. Everything is the same when she is cured but her eyes from what I understand, whether that's a bug or not dunno.
If you are not a vampire, she will still use her drain spell and infect you with it if you're hit. If you're outside, she'll still complain about the sun too.
So it seems her being human was more aesthetic than a gameplay mechanic, so I doubt it'd have effect.