God just 17 when she had her kid, and basically shunned and discouraged every time she would go out for a night. That was probably for the first time in five years.
I understand that room for resentment she was basically there to become a mother too soon and wasn't ready for the role. Nor did she have that network or support she needed.
But also I see she still tried with her son to an extent until she just gave up because there was a natural rift between the two. It doesn't excuse her neglect but I understand it. Course there is also the husband there.
Her husband doesn't seem like much either, a real piece of work there, and didn't really help her in that department. They really shouldn't have been parents so soon.
I wouldn't say she's a narcissistic bitch, rather a very lonely and resentful person, who had her life upheaved far too quickly and only near the end of her life could comprehend or do so beforehand but it was long gone for her son and her.