I see. Possession might work on her then. But is it something that Dahlia usually starts with, right off the bat? Because she'll need to, considering the fact that Sabrina is immediately going to go straight for the kill with Hellfire. Also, after possession, what does she usually follow it up with?
Honestly, the whole desiccating thing might not work, now that I think about it.
Sabrina has survived having most of the water in her body being rapidly removed while she was significantly weaker, and IIRC even that didn't keep her down for too long.