Nickname help?

One of my characters frequently goes by a nickname, but a lot of people call her by her full name too. When I'm writing, I'm not sure if I should address her by her actual name or her nickname (when I'm just writing narration). Tips?
Thanks :D

Well its more common to call your characters their nickname. But make sure the reader knows their real name too

@Larklynn Thank you! :D

What does your character introduce herself as, the full name or the nickname? The most common answer is probably going to have the most impact. For example, a girl who goes by Liz is going to have a different reaction to someone calling her Elizabeth than a girl who introduces herself as Elizabeth has to someone calling her Liz (if that makes any sense ^^; ).

Here's a suggestion: have characters who are close to your character with a nickname call her by said nickname and acquaintances call her by her real name.