Next you're going to tell us she's a grade school teacher.
If a gallon costs $1.00, then taking a bath would cost about 40 bucks!
If lendaddy's stuff is correct, then 26.12 cubic feet = 195.378 gallons. Does that seem right?
Also, +1 on finding out what the unit of measurement on the meter is, and if there's a multiplier, like x10 or something.