I like Elizabeth and Helena, probably I would myself go for a slight variation, like Elena (I think that is how it is spelt say e-lay-nah)and something a little more cute for Elizabeth like Libby or Elspeth or at least for a nn, here is nameberry's comment on Elizabeth:
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ELIZABETH
Gender: F
Origin: Hebrew
Meaning: "pledged to God"
Popularity in 2009: #11
While Elizabeth, one of the premiere classic girls' names, is just outside the Top 10, there are actually fewer babies getting the name these days. It has so much going for it rich history, broad appeal, and timeless style that no matter how many little Lizzies, Elizas, and Beths are out there, you can still make it your own.
Nicknames & Variations:
Ellyssa, Beth, Lisabeth, Bettey, Elisheba, Elisabeth, Bett, Lilabet, Lyzbette, Ellie, Bess, Lyzbeth, Elyssa, Leeza, Betsie, Elizabee, Elysabeth, Bette, Elyza, Libbi, Bet, Alizabeth, Elyzza, Lyzbet, Elyse, Bettie, Elsy, Betsi, Ellsi, Leesa, Elisheva, Lyzanne, Elisabith, Lisabet, Lyza, Lizabeth, Ellspet, Ellyza, Libby, Betsey, Lizbet, Bessy, Bessie, Lyzette, Lizanne, Betty, Liz, Betsy, Buffy, Lizzie, Lisbeth, Ellyse, Lysa, Bessi, Lyssie, Lisanne, Ellisa, Elsee, Lizzi, Lilibet, Lizzy, Lizbeth, Lilibeth