I don't think her snubbing your email has anything to do with you being creepy.

Most college professors don't get straight back to you right away. Sometimes it takes a couple days, maybe more. Some not at all. My favorite college professor hardly replies to any of his students emails because he'd rather speak in person (and he can spend all three hours of class time talking your ear off.)

I still visit my 8th grade science teacher, but we are in a camping club together so mostly I just see him while we go camping, but then once or twice a year I go in while he's teaching and catch up on how things are going. I've known him for ten years now and we are pretty close.