Warning, this is for introverts only.
So if she hangs out with you, laughs at your jokes (yes, the lame ones), supports you in conversations or arguments, and the last one (especially important) is if she says hello and goodbye whenever you see her. If she will especially make an effort on that last one, then she likes you. Again, this doesn't apply with extroverts (especially those that are really flirty)
English