While there doesn't appear to be anyone looking her way, immediately, when she peers out, she also notes that the room isn't empty, and it's fairly well-lit. She'd very likely be spotted, even if she tried to sneak, with her potion.<br/><br/>However, if she's willing to wait about ten or fifteen minutes, a serving girl, dressed in a plain, brown and white dress, will pass by close enough that Chess could abduct her and steal her uniform with little difficulty.