Is this girl interested in me?

okay, so I'm having difficulty understanding this girl. Lately, we've been texting a lot and I kind of like her. Anyways, I try to flirt with her through texting and she almost always responds back positively. However, sometimes when it's REALLY obvious that im flirting with her she goes, "omggg" and changes the topic. She also said that if I wasn't her friend she'd think I have a crush on her to which I responded in the same way (if I wasnt her friend, I'd think she have a crush on me etc.). She said "omg" and changed the topic again. I am pretty confused as to how to go about this because sometimes she makes it pretty obvious that shes flirting with me and at other times she randomly changes the topic... help??