I would say that yes she's probably human. Look at that diamond necklace she's wearing, she got dressed up for something or "someone" and if she's the only survivor she's probably not very happy right now. And besides, she's wielding her shoe as a weapon. You ever confronted an angry woman with a shoe? Zombies don't do that so you're good on that front although your crew might want to get out of her way
Yeah, I once took a stiletto to the forehead because I thought she was joking. Turns out, she wasn't. Zombies got nothing on a woman who means business, especially when her man is getting in the way of said business.