Sorry, but I'm having a hard time feeling sympathy for this woman. Yes, she was tired and horny. You know who else has been tired and horny? Every human being in the world. That doesn't mean we go into the wrong apartment and blow innocent people away. She did a very stupid-*** thing, and there's no excuse for it.
However, I have to concur with mb227 at least based on the evidence we're seeing now. To get to manslaughter, they'd have to prove that she knew of and consciously disregarded an unjustifiable risk. I'm not seeing that here. The big risk she took was firing the gun, but by the time she did that, she believed there was an intruder in her apartment. Well, firing a gun at someone you think is an intruder is pretty easy to justify. To get to manslaughter or murder, you'd have to somehow prove that she didn't really think there was an intruder in the house or that she knew she wasn't in the right apartment. At least in court, I haven't any indication of that, even though there was evidence of that during the investigation.
Either way, I hope she goes away from awhile. She's rotten.