How do/would you react if a past student reached out to you?

Hopefully this isn’t against the rules but I’m not a teacher. I am hoping to get a teacher’s opinion on this though, so hopefully I’m in the right place. I graduated high school almost 20 years ago. I recently found one of my old teachers on facebook and thought about sending her a message. She was my favorite teacher and really helped me get through high school emotionally. I mean she also helped academically obviously, but I had a hard home life growing up and this teacher was always there for me. I wanted to reach out to her just to tell her how she helped me and had an impact on my life. I just didn’t know if that would be creepy or weird or if she would even remember me. So how would you react in this situation? If a student found you 20 years later to thank you would you be creeped out?