Basically, this person is saying something in a sarcastic tone of voice, but actually means what she says... Does this description work? Is that what you'd get from "fake sarcasm"? Because, you know, she just talks in a way that's really sarcastic, but in this case she's just stating the obvious rather than actually being sarcastic about it... Blergh. Could this just fall into "sarcastically" or would that make you look at it again and wonder what she meant instead of it?