Glad to see this thread, I read that piece earlier on and thought it was horrible.
I get some of what the author was on about, that it's bloody difficult and naturally thankless being a mum/ a parent. But the whole overriding tone of 'you should be grateful, I've sacrificed so much for you' etc, that was nasty, manipulative and as Pictish says, it's really asking for an 'I didn't ask to be born'.
Reminds me of the type of thing my mum said repeatedly to me when growing up. All about her suffering, her sacrifices, her everything, her her her. The fact is, life with a martyr mother is very depressing for everyone. Especially the child. I felt guilty for existing.
I don't enjoy several parts of being a mum. That's not my child's fault. It's mine. I selfishly wanted a child. I had one, for ME. My satisfaction, my ambition was fulfilled by becoming a parent. Except, the reality didn't and doesn't often live up to the dream. And that's my fault.
Stupid and horrible guilt trippy letter. I also reckon that this is how the author thinks generally, and just because she never says them all at once, like she does in the letter, to her son/s, they'll know exactly how much she resents them. They'll know full well that (for example) she could have had a better career if it wasn't for doing all kinds of stuff for them, and the knowledge will weigh them down. What an awful burden.