Ava Nicole is really nice honestly; it rolls off the tongue so effortlessly and is extremely classy (i.e. when she's an adult you won't regret calling her Ava).
Riley Alexandra is super cute (my name is Alexandra so I might be a little biased haha). I like that it isn't a common pairing, and Riley Holden sounds good together.
I'm not the biggest fan of first and middle names both ending in the same letter, but I prefer Alexandra Victoria to Isabella Victoria. However, Isabella could be used in the form of Isabelle instead. You could even use McKenna Isabelle to incorporate it that way.
I mention McKenna Isabelle because, although I have no problem with the middle name Grace, I think you'll find oodles of people with the name McKenna Grace.
Charlotte Amelia is adorable. Again, so classy.
I actually really like Emerson Claire. I love the feminity of Claire in contrast to the more unisex/masculine Emerson, and I wouldn't be too worried about the "n" sounds; I don't think it sounds bad!! I love Addison Paige as well!!! Not an incredibly common pairing either.
Madison Isabella is cute, but I've never liked the name Madison... I know WAY too many people with the name Madison, and I think you'll find a lot of people with the names Madison and/or Isabella. However, if you love Madison, go for it!!
My top 3 are Charlotte Amelia, Riley Alexandra, and Ava Nicole. However, whatever name you love the most, you should go with it!