I actually like the suggestion of Elizabeth. It may be common, but more in a classic way, not in a trendy way. Plus, no matter what her little girl is like Elizabeth has a nickname that suits pretty much any personality. If you name your kid Elizabeth, you let her choose being Elizabeth, Liz, Lizzie, Beth, Liza, Eliza, El, Ellie, Libby, Bizzie, Betty, or any of the other nicknames she likes.