My name is Allison Kate :) Just thought that was neat!
Anyways, maybe Allesandra, Alexandra, Alexis, Alicia, Allysa, Allysabeth.
I went to school with an Alicia who went by Ally, my best friend calls her Allysa Ally, and I saw on some parenting site someone named their little girl Allysabeth and called her Ally.
I think Allie by itself is cute though! If you like it, go for it!