How do I read what she tells me?

Im guessing the best way to go about this one is to push it up a few gears. In other words, bring out some major confidence, charisma, smiles, but not complements... they are just too cheesey right at this moment. The aim is to treat yourself in the situation as the prize... but NOT cocky/arrogant. Be confident and a bit flirty with her. If she starts playing with hair, scratching her wrist (i know weird, but its a sign), pupils dilating, puppy dog look, laughing etc.... she is into you. If she reacts as though she wants you to back off, dont act too bothered. Fine, she isnt into you but at least you tried and found out. Not by asking, but through your actions. Mind you, if she is in the relationship she's in now and you turn on these attraction factors, im sure she will be drawn to you. Good luck :)