i've been there, friend.
Try making sure that you pick the option "Stretching can't be bad for you" or something of the sort when you Look For Grace. Meryl will end up stretching, and MC will put a calming spell on Grace as a result. You can also apply the oil you get from Lexi(?) to Meryl, and I'm not sure if that's exactly necessary to put the calming spell on Grace.
Also make sure that you got the Freya scene, which you get by replacing the powder with the pill you get from Hannah when you find her clip (after exploring and overhearing the pill that the random woman has).