Hm. Transformare by iulia_linnea. Actually, she even had a comm devoted to girl!harry fic. You can find her girl!harry tags here. Mostly drabbles/ficlets, but all worth a read if girl!Harry interests you.
I'd also suggest Pigfeathers which is a fic where Harry is transgendered and takes a potion made by Snape to transition from MtF.
Graduation Plans is another transgendered Harry. I have it saved in my bookmarks so there must be a reason. Though the fic says it's not to be taken seriously and I can't recall it. So, not an unqualified rec for that one.
The Mathis Prophecy features always a girl, but it was a secret!Harry. In Mulieribus where Harry is changed into a girl from a curse. And, The Perfect Wife where Harry is born a man, but was raised to believe he was a woman.