Super Smash Bros. 4 Model Project

[Pik]

The texture is already black and white.

It is, but it's mainly black right?
Invert the colors so it's white instead, then paste it into her full face texture. Make the rest of her face black except her lip area and it should work in a Brawl-like engine. (I know you do Brawl mods, so you know what the spec maps in that game look like)