My suggestion would be straight forward truth. But not in a creepy way. It should be common sense, to speak about your problems with the person that is partially (or fully) responsible for the reason why you feel like that. Maybe she will understand you, maybe she won't, or she will be weirded out by your sudden approach. Women operate by following their own and other people's feelings so keep that always in mind.
Observe her reaction once approached, and act accordingly to how she responds. Just keep your spaghetti in your pants and man up for the girl that you like. It will feel better for you, to get that problem out of your mind
A year is a long time. A lot might have changed. Ask her out for a coffee or something. Chat with her about her life, how she has been doing lately. Keep calm, let the conversations flow naturally and you'll be fine. You can do it, anon. And even if she says no, it's not the end of your life.