Straight girls I need your help some advice! please answer this :)?

I have a friend who is totally straight girl, her personality attracts me, she's 18 but act in a cute way as 8 yrs old by the way i'm . Our friendship is unique because she always tease me or bully me, but recently she's been kind to me little by little i mean yeah there are still does teasing and bullying moment but I think she's different. Sometimes she'll touch my hand but before she never did that. I'm confused bec. of her being nice now, do you think she had a crush on me? or she just love teasing me?