Does this girl like me 10 points for best answer?

I met her in a night club last year I was chatting to her sister she come barging over to where we was chatting and she started saying that's my sister ya gotta chat to me if ya wanna chat to her. A bit over protective so after a few sweet liners to her saying ya sister in good hands she backed off and I heard her say to her mate I think I'm in love with him just as a joke lol. Then over the past year her and her sister have become good friends of mine I don't chat to her sister much now but I chat to her every few weeks then today valentines day she messages me saying happy valentines day hunny xxxxxx I just replied thx u 2.......but judging from that am I her valentine or was it just a friend being nice cause I'm under the impression she likes me