[nods grimly...] She might not be the enemy... but she's still going to kill every week. Or her allies will.

Could trip them up with more sensory deprivation coupons, but it's not like it's guaranteed to prevent a kill. Especially when they work in pairs, and we don't know which two are going to act on a given night.

I've already looked into whether a more potent incapacitation spell is possible, but that was a no.