Well. Masako is afraid of the Medusa based on stories she's heard so she's likely to go after the Dryad.  (That and isn't being petrified considered a pretty permanent game over for that person unless they'd get cured of it at some point. Can't count on the party for that. XD Remove curse is a higher level spell than we have or can get right now; and it doesn't go away if she medusa dies (I think! I'm not sure.)