I think you are spot-on!!
I've been saying that she has deeply unresolved issues with her son because it's clear there's something else going on here. That's as far as I've thought about it, and you've completed the thought for me. Thank you!
And Bravo!
It's not so hard to figure. This lady has obviously always been a 60s holdover fever swamp type. Her way of coping with the death of her son is lashing out at Bush. It gets her lots of self-affirming attention from the "Failure is an option" Left and their fans in the media.