How do I find this girl? Is it normal to keep searching for someone like this?

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basically there's this girl I met and I think she's interested in me which is great because I'm interested in her. I hesitated and couldn't continue the conversation. The thing is I have been looking at the school for her a few times and no luck. It was early in the year when we had a class together. It could be she doesn't go there anymore but I can't help but let her go. Some years back I flaked on a date. I even didn't go out with this girl who suggested we get together.
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I could enroll there again. I'm currently going to a different school but not far. The thing is I could be setting myself up for failure. Perhaps she doesn't go there anymore.
I remember her name but couldn't find her. Maybe she made herself unsearchable.
I don't know if the teacher pronounced her last name wrong but the way I spelled it on facebook is how he pronounced. I checked online to make sure that's how you do it. It's possible her last name is spelled differently