@Creepy_Rainbows1234 I wrote my crush a confession letter and got my friend to deliver it to them, now I'm their girlfriend so uh that can work sometimes. I would advise going for a face-to-face approach though, maybe just wait until you see her alone or something, strike up a conversation, see if it sways in the direction of anything related to what you want to tell her, and then just go for it. Best thing is to stay chill and honest. That will encourage her to do the same :)
Or feel free to ignore all of that, I'm not an expert on these kinds of things, the letter I wrote was actually anonymous but my crush recognized my handwriting and wrote me one back, which wasn't the plan but hey I'm not complaining-