I think it sounds credible and is a very pretty nickname. I would say it like ZAH-lee-ah myself, if I had to guess by looking at it, but it's nothing a few reminders wouldn't soon fix :)
I'd just let a nickname come naturally to you. You might be surprised what you come up with once you take that pressure off yourself. A family nickname can be as farfetched as you like! It doesn't have to relate to her birth name at all. That way you get the best of both worlds, you don't have to choose between Rosalie and something else.
This message was edited 4/10/2012, 12:58 PM