OK, Not "War Toys for Christmas," but For a Birthday. . .

[Filliam H. Muffman]

Is there a sibling or neighbor to have fights with? Multiple guns. Two pistols so she gets training dual wielding, and then a long gun of some sort.

I have no current experience with the lineup at Toys-r-us. warning: Gizmodo link.
The Best Nerf Gun for Every Kid (At Heart)

Edit: might want to include eye protection.