I honestly do not understand how someone who absolutely does not want kids can allow themselves to be browbeaten into keeping a pregnancy. It's not like just doing some annoying thing once and getting it over with - it's making a whole new person that will need to be supported for at least 20 years, most likely more because most young people can't afford to live on their own.
If you allow yourself to be coerced into breeding when you have access to abortion, adoption or safe havens, you are not childfree. And of course when the kid is born to people who don't want it, the kid will be the one to suffer the most, which seems to be the case here. Sounds like the kid is terrified of being abandoned and the author admits she hates the kid just for existing, and the fact that the girl never throws tantrums tells me she is probably walking on eggshells all the time because she's afraid to be bad because it might make Mommy not come back.
And of course Duh has decided that nobody needs therapy in this whole trash fire of a situation because he probably knows any therapist will say he's a toxic shit heap and for Moo to distance herself and her kid from them.
Moo should have stuck to her guns. She doesn't want to commit to the Duh because he wasn't Mr. Right. Why have a brat with someone who was just a fling?
Whether Moo stays or goes, the kid is gonna be so fucked in the head. She'll probably grow up to be the kind of woman who latches like a lamprey onto anyone who shows her a speck of decency because of abandonment issues.