Operatic is a wonderful description for it!
Giuditta Leonora is beautiful. I like that - ora pairing with
Giuditta. I know it's a bit simple but
Giuditta Flora came to my mind right away. But you're right, it needs an extra syllable.
Giuditta AuroraGiuditta Melora
Giuditta FeodoraGiuditta Eudora?