As long as eggs and dairy are still OK, she’ll be fine.

You should give her a deeper insight in the matter; that the animals that food is made from are bred to be slaughtered and become food, and live under good conditions and are taken good care of by farmers. I grew up at a farm, and have always known this, but I think proper and correct information is the best way to fight misunderstandings and lack of knowledge.

Congratulations, you married an arsehole. Seriously, what a dick. If she's that traumatised then talk to your GP surgery, explain it's a trauma response and you are worried about her diet until she processes things. Get them to refer you to a child nutritionist for a full crash course in how to manage her diet in a healthy way and for the correct supplements. After you've spoken to a professional then start your internet research. If she never touches meat again then you need to teach her how her body works, what it needs and how to eat healthy from the start. Until then, go maliciously veggie. It doesn't do anyone any harm in the short term and maybe a few weeks of mushroom burgers*, fake bacon, cauliflower cheese, and salads will make your dear hubby think twice before opening his bloody stupid mouth again. *Seriously Mushroom burgers are 🤤. Find the biggest Portobello mushrooms you can, fry them in butter until soft, dry the outside with kitchen paper and serve them up in brioche buns with salad, sauce and plastic cheese slices. Effing delicious, even for the carnivores.

How did she not know that "We're having chicken for dinner" means the same chicken that walk around clucking. It's the same word? She's almost in school, the other kids would have told her right away.