If you don’t like Elle/Ellie, I’d probably rule out [name_f]Eleonora[/name_f] as I feel like those are ‘go-to’ nicknames that people almost assume/use automatically – more so that [name_f]Cory[/name_f], [name_m]Cordy[/name_m], [name_m]Cody[/name_m], or even [name_f]Ronnie[/name_f]?
I’d personally go with Cordelia; pretty, elegant, rolls off the tongue