Um, tread lightly with a ds child. Think fast and you can stop a tantrum before it happens. Think outside the box. My split second reaction would to have been to knock over my own drink when she wasn't looking and said "oh look, it can happen to anyone" throw a few laughs. This unorthodox approach takes the focus off what she did and turns it into a harmless situation. Is having to clean up a mess and chase down a ds child easier than sharing a mistake and having a laugh about it all while keeping her with you. Having her out of sight even for a few seconds is not safe. There are all kinds of monsters out there especially in the mall. Good luck to you!