@contrex,
Quote:You would not use 'as if' if you already knew that she knew everything
For what it's worth, I disagree with this. Your question was about the use of "as if." It's always
possible to write something in a different way, but there is no
need to in this case. The following would make perfect sense, would violate no rules of grammar or usage that I'm aware of, and would be easily understood by all:
"She looked as if she knew everything, and she did."
You're simply adding that her state of mind matched her looks.