I have made a mash of yogurt, pumpkin puree, ground layer feed, and scrambled eggs. She is not interested. Tried just scrambled eggs the other day, wouldn't even touch it. I will give it a go again. Hate feeling helpless.
I completely understand

Those members of the flock who are obviously smaller/slower/weaker than the rest, are so for a reason. Do not spend a moment blaming yourself. If she begins to really fail and she is suffering, be kind and help her. Right now it doesn't sound like she is there, just looking ahead to the worst-case scenario, which hopefully isn't where it will end up. I am keeping good and hopeful thoughts for you and your Hattie.