Maybe try changing it up a little more. There are some hairstyles that can probably be swapped out for each other like if it is curls there are a lot of curls to choose from. Also is anything else similar?
But if you want to keep your character the way they are and reach out to the author in case they come across it and accuse you. Not really your problem if you had this character for ages but there was some insta drama over similar characters but honestly you could say that about a lot of characters. They do own copyright to the characters so maybe have proof to show in the unlikely case this becomes an issue.
Thanks, I guess. 