IMHO... I have known some people like this and you hit the nail on the head. She is incapable of showing true love to anyone. I could throw around words like narcissist or personality disorders but it boils down to what you said. She cannot truly show or feel love to her children or her husband. She probably had a vision of her life and it didn’t come true. Even if it did, she would be unsatisfied simply because she is incapable of feeling any true happiness. The people I pity, however, are her children. She just told the world that they are like parasites that made her unhappy. Sheesh.....
I wonder what she wanted, and why she didn't do it instead (or in addition) to having children?
I was going to be Director of the Internal Revenue Service and have an apartment in the Watergate, with cats. Well, the Watergate was razed years ago ... and I have the cats anyway ;-). Some days I'm not happy with my life, but I don't wish I had a different one - just that this one would go better!
There is probably a mental health/personality issue here but I think you got it exactly right. Some people will never be happy, period.