Moueix, get your own back in subtle ways... wait til she's painting her nails, give her a tiny nudge. Just put up with the abuse. You can say, 'at least you haven't lost an ear' or similar. Wait til she's in the shower, flush the toilet. Again, put up with the abuse. Wait til she's doing her make up or drying her hair, shut off the power for a couple of seconds...
Maybe she'll catch on?