She could use batteries... but what I was thinking was that if the laptop fell in the drink, would that make the batteries possibly short-circuit? An exploding lithium-ion battery sounds rather unpleasant, espicially if you're already nekkeid with no clothing to protect you. Yikes.
Plus... I mean... laptops cost between a thousand and a few thousand dollars!!! I mean, one splash, one slip, and the system could be toast!
Ironically, within the next few years we might see specially-designed terminals or computers for just this use.
(Goes off to invent the water-proof toaster.)