So sorry you have to go through this. Please get a plastic surgeon so they take of her beautiful face!
As for the addict, they don't understand. There's no point in trying to reason with them. It's really frustrating doing so, so I wouldn't even try to make him do things, e.g. check in on his daughter, unless he takes initiative to do it himself. He's just not going to think the way non addicts do. Any normal father would be at the hospital with the little one, holding their hand, making sure they felt secure while having to deal with something as serious as MRSA (I've had it - it's not a joke, but it's totally fixable).
Have you ever thought about going to therapy or al anon? It really helps so you don't "waste" anymore energy on him than you need to. Taking away precious resources (your positivity and energy) that you could spend on your beautiful little girl isn't good, especially if it's wasted on someone who doesn't care.
Anger is a normal response though. Hope it turns out okay for the little one!