It's already got one though. Why give it some other one when the first one's perfectly good? "Car". Kind of short, but gets the point across!

[And before that, 'vehicle of some sort' which also worked. She'd have found out the particular type of vehicle sooner or later! But she wasn't going to call it a chair just because her butt was on it.

Children were.. odd. She understood eventually they'd be normal adults but until then..]