Most Helpful Girl
If she values your friendship I'm sure she'll forgive you for telling her you love her. It's not like you were mean to her. If she can't forgive you then I'd question the friendship you had with her. People who care about you as a friend forgive you because it's the mind which gets angry but the heart still cares.
Most Helpful Guy
Delete everything about her, unfollow her on IG, Twitter, etc. Take out her number. Throw away anything that reminds you of her. The best way to get over someone is to get under someone else. If that's too dramatic lol then "it takes time" will do