Elizabeth is one of my all time favorite girls names, ever. Personally I like it paired better with Katherine and I adore Libby Kate.
However, and I am guessing that I will be in the minority with this, Hadley is high on my list of guilty pleasure names. While I would never use it in the FN spot, I have considered it as a MN. I think it's just lovely sounding, so I like to hear this name on little girls.
Or, have you considered Elizabeth Hadley?