When the napkin disappeared it sidetracked her original reply while also making her double-take. That did happen, right? She was a little weird... but... Her eyes squint in thought for a moment. Provided she wasn't exactly a newbie here, it shouldn't have been so surprising. But still, Sheri could be child-like at time.
Finally she decided that she really wasn't seeing things, "I should have asked for that ability instead."