Is this a sign my friend likes me/is a ?

i'm a girl & my friend who's a girl has been acting really strange towards me. she consistently ims me, texts me, facebook's me even if i don't do any of that stuff first. she always makes the first move. she gets upset when i dont talk to her all day. she calls me cute, beautiful, y, etc. she's always around me & puts her arm around me. she always asks me questions about myself & makes the effort firsttt. are these any signs that she has a crush on me? helpp! :x