Sandy doesn't handle relative dates intuitively

I don't feel like Sandy is always handling relative dates quite right.

Today is Wednesday the 12th. If I say "Tuesday," Sandy thinks I mean Tuesday the 18th (which I think is right). But if I say "next Tuesday," she thinks I mean Tuesday the 25th -- when, in almost all cases, I mean Tuesday the 18th. (I assume that if I want to refer to a Tuesday after the 18th, I should specify it by date to avoid confusion -- wouldn't most people do the same?)