She was adopted and grew up in New York.
You are suggesting that she blew her brains out because she did something to her child.
I am suggesting that she blew her brains out because she felt that she had failed her child. I.e. someone took him when she wasn't fully engaged. I am also suggesting that while she was perhaps raised in westchester, she might, just might, identify with people from Japan who off themselves for various reasons, honor being one of them.