I love the name Kendall Elizabeth! I think it's so pretty and it's such a strong name for a girl. Our original girl name was Kennedy and Kendall was a favorite of mine too. However, keep an eye on her initials since there are vowels in the name (i.e. if you choose that name, I hope your last name does not start with a G lol!). I'm a stickler about initials - mine were almost HAG (thank you, Dad, for changing it!!!)
I think the other two names are very pretty (Allison/Allie is my second favorite it).
Abigail is pretty, although I think it's ranked fairly high on the S.S. list, if that is a consideration.