Well, I have to figure Sydney wouldn't let just anyone know that all her magic can be turned off just by smearing some dirt on her back, but it could very easily be that Lorelai recognized the tattoo for what it was.<br/><br/>Alternatively, if Lorelai isn't someone who would know something like that, we can always decide on something else... possibly that Sydney is SUPER-sensitive just behind her ears, and a slow neck massage can put her to sleep damn near every time