Most Helpful Girl
If she's lying, she's not a good friend and you should cut things off.
But if you're not in an official relationship yet, then technically, what she's doing isn't wrong. You can't really dictate a girl's actions, they'll hate that.
From the looks of things, you just have to decide if she's worth it. I think she might be taking advantage of your kindness, but if you feel a connection to this girl, then you just have to cut to the chase and tell her so she'll stop doing these things.