Buy a few cans of fishy stinky cat food. Stir in only a teaspoon or two into her food.

I had a pup who was a terrible eater. He was on a lamb and rice food, as recommended by his breeder. Turns out he cannot tolerate rice. Changed his food and he loves to eat now!
It is as if he knew the food wasn't good for him.
I would change the food - different protein and different carb, and see if that helps.

I find many of my pups go off their food around that age because they are teething. I've including hand feeding to get them to eat. Mine grow out of it in a couple of weeks.

You might try worming again - sometimes that makes them feel "off"

Check her mouth. She is loosing baby teeth. Her mouth will be sore. She will eat again.

Oh for heaven's sake, just reduce her food to what she wants to eat. When she's hungry, she'll eat. She may have an entirely different idea about how much she should weigh than you do. We're not fattening them for market.