Girl made me a birthday card?

Birthday was in November and a girl in one of my classes made me a birthday card when she found out it was my birthday. She also had the girl beside her sign it. There was a little heart in the card, as well. I know it was months ago, just trying to figure if maybe the girl liked me at the time, I'm kind of bad with trying to figure out signs like this. The girl used to message me on MSN sometimes, mainly if I had been away that day (she'd ask me where I was). What do you think? Was she just being friendly?