Do you think I should stick with the name Ellie or start using Eleanor again?

I've been debating that for myself recently, too. My name is Rebecca and most of my friends and family call me Becky. I'm 28 now and I don't know many 30+ women known as Becky. But I like Ellie, it's classic and timeless. Eleanor is a beautiful name, but I really like Ellie too. If you still like Ellie better, maybe give it another four years and see how you feel after school.