Inverted wing-rocks can be amusing, but the most impressive I've seen recently were at Duxford where one competitor deemed that his first freestyle figure required sufficient oomph to require his wing rocks be performed on a vertical down-line rather than the more traditional 45 degree dive.
To the OP - attempted public high-jinks in touring aircraft invariably result in embarrassment, passenger nausea and sometimes a lot worse. A more impressive feat would be to give your Ma an expected time overhead and arrive there to the *precise* second....(...and then maybe have one of the sprogs send her a text message...)