She'd be a swordmaster (you mean this, right? Eyvel?), probably. And with some cool stats, but failing a bit in strength and defense maybe.
Eyvel:...Lord LEaf, there's something you must know.
Leaf: What is it, miss Eyvel?
Eyvel: I think my memories came back. My name is Briggid, and I accompanied the father of Lord Celice years ago.
Nanna: Is that so? Mother never said that.
Fin: Lord Celice, he leads the army north of here.
Leaf: Then let's get going, we must first stop Blume before joining forces.
What if Mareeta never left and accompanied Leaf for Gen2 of FE 4?