I don't think, "you don't understand, she wasn't grieving the way women are supposed to grieve, and she was dressed like a slut," is exactly the defense you seem to think it is...
There's not a "right" way to grieve. And someone isn't "wrong" because they process trauma differently than you would. And none of that is an excuse for slut shaming.
I don't think, "she deserved it, just look what she's wearing, and if you tell me that's a wrong thing to say it's because you're infantilizing women by saying they can't be wrong," is quite the defense you seem to think it is.