What are surefire signs she only sees you as a friend?

We all know that girl can quite easily be a bit to friendly and flirty with guys they have no interest in, especially if the guy is one of their friends. Everyone for the most part also already knows the signs that someone likes them, but are there any little hints, or things that a girl might say or do, if she sees you only as a friend, that she wouldn't do with someone she has a romantic interest in?
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I'm not asking this because I currently have a friend who I'm not sure if she is into me. I just want to know the answer to this because way too many times, me or my friends (in the past) have gotten burned because the girl was totally flirtatious (cuddling, hanging out on almost a daily basis, texting on almost a daily basis, being very smiley and playful, leaning her head on the guys shoulder, etc.) but ended up only wanting to be just friends.
What are surefire signs she only sees you as a friend?
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