Is there a chance that this girl likes me?

I was working as a teacher about a four months ago and i was teaching a course to this bunch of random people. There was a girl in my class that really felt comfortable with me. She started to ask me personal question and next thing you know we are giggling and telling jokes like friends do.

She looks likes she is really into me she is 17 years old and i am 21 years. I have stopped teaching and i only see her sometimes. When i do see her she always smiles at me and giggles at every thing i say. Sometimes i fly pass her and say hi, she says hi back and she blushes , smile and bow her head down. Is there a chance that this girl really like me? Girls has this happened to you with your teachers?