Ensuring that she's maintaining appropriate hygiene. But really, this should only be done as a last resort - in the interest of her emotional maturity, it's important that an emerging adolescent develop a sense of her own right to privacy.
Anti-humor is a type of indirect humor that involves the joke-teller delivering something which is deliberately not funny, or lacking in intrinsic meaning. The practice relies on the expectation on the part of the audience of something humorous, and when this does not happen, the irony itself is of comedic value.