Dude, I have sex dreams all the time and it doesn't mean shit. Except that my subconscious is almost as big a perv as my conscious conscious, and I might be a little hormonal.
Didn't read any previous posts but the chances are that if a dream like that meant anything serious to her she wouldn't have told you about it.
Not sure what the dream means in and of itself, but I wouldn't tell someone I had a dream of the two of us having sex if I wasn't open to the possibility of it actually happening.
Did this help you understand your situation?
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If you have read my old post it might help