I like [name_f]Sofi[/name_f] (same as Sophie) for her! All the sounds are there and it’s really cute!
[name_f][/name_f][name_m]Other[/name_m] ideas:
[name_f][/name_f][name_f]Fifi[/name_f] (Serafina Ophelia)
[name_f][/name_f]Sephie
[name_f][/name_f][name_f]Effie[/name_f]