I know some people don't prefer more than one middle, but that's ok since they don't get naming rights on your new baby. (Isn't it great!)
You should do what feels right to you! Whatever you decide, she'll have the perfect name and you can't lose that way. Have you taken a little time using each combo on her to see what fits?
FWIW, all three of our girls have two middle names. It just happened to work out that way with our first DD and then there were three names and a theme we loved for the others, so we chose to continue it with them.
Kiley Julianna Grace
Isabelle Jenna Faith, aka - Ellie, Ellie Bellie, Elle Belle (you get the drift)
Casslyn Jacey Hope, aka - Cassie (Jacey is after daddy/DH, Jason
Our boys both have just one middle name, beginning with a "C" (again, just worked out that way...second son's middle, Curry, is a family name).
I know the initial decision-making can be really
difficult, but with mine, I can't imagine any of them named anything else...and Cassie's only three weeks old!