Slaps Roof of Car - I'd buy her

She's pretty much the ideal RPG meat shield follower though: practically invulnerable, comes with high quality armor of her own, can't hit anything so all experience points will be yours, lowers enemy morale by being creepy, won't ever leave due to being treated badly (actually would like it)…

I'd buy her. But I'd really haggle the price down just to drive it home a bit further.