Wow, what a humorless bunch! Professionals (especially 13-year-olds) must always be serious?! This is one of the silliest "debates" ever to appear here. These "pranks" were not the norm, nor did they disrupt a show (except on rare...VERY rare...unexpected ocassions).
To suggest that Andrea's ocassional pranks reflect a lack of seriousness about a production, or an absence of any appreciation for her success is, of course, nonsense. Anyone who knows Andrea, or even has seen her perform, would be hard-pressed to accuse her of not taking her work seriously, or slacking off. For every "M & M incident," there are countless examples of her going above and beyond--for example, when she finished a performance of ANNIE after having been knocked unconscious during HKL.