If a girl blushes when you smile at her... ?

okay so there is this girl i'm in love with. The day before a masterclass at our university, I asked her if she would come because I haven't got a chance to talk to her since semester started. She said no because she was exhausted etc... and told her that I was a bit sad because I wanted to see her as i didn't get to have a chance to spend time with her since term 2 started but that I understood and wished her to have a good rest. next day , I wasn't expecting her to come, and yet there she is walking through the door and looks at me right away, obviously i can't help but smiling all over my face as I wasn't expecting to see her anymore and she looked down blushing... when a girl reacts this way when you smile a her, does it mean she is into you or just because she is shy or something else?
If a girl blushes when you smile at her... ?
Post Opinion