Are you suggesting that "Guinness Draught" is not a stout? I understand that she was stating that "Guinness" was "on draft".
According the the source,
http://www.guinness.com/en-us/thebeer.html, the brewery's names appear to be Guinness Draught, Guiness Extra Stout, and Guinness Foreign Extra. All are stouts.
So, I think the natural expectation when you say I want a "Guinness Stout" would be that you get a Guinness Draught, their flagship product. If you want the Extra Stout, you gotta ask for a Guinness Extra Stout.
That's how i see it anyway.