I'd go with either Amelia or Emilia - Emelia is a bit of a hybrid and I prefer traditional spellings. Amelia is English; Emilia Italian. If you go for Emilia she will probably have to spell it, but all you have to say is 'it's italian for emily' and i'm sure a lot of people will get it. I think Em/Emmy are really nice nicknames.

I vote Emilia!!