Does this girl like me? or is she playing some joke like the last girl who "liked" me?

I would ask you a few questions in return: does she know that you like her? what is she like outside of your cles? is she known for being a mean person? has she done that to others in the past? It's hard to say if she is flirting with you or not...from what I can tell of the conversations you've described, she is merely trying to be friendly towards you. Now, if she were saying those things in a very lovey-dovey way (slowing down her speech: Heeey Euuuuuan!) or acting more cutesy around you while she's talking to you, I would say she is definitely making like she is flirting. I know this doesn't really help that much, sweetie, but I do hope it gives you a better idea of what to look for when she talks to you.