For chicks, 2-3 mealworms a day each bird is more than plenty. You want them to mostly be eating their feed. I don't think it's related to your ailing bird's issues, but I had to ask since it seemed like there was a lot sprinkled around.
I'd treat her for coccidiosis, the poop is a bit concerning as is the lethargy: https://www.backyardchickens.com/articles/treating-coccidiosis-with-corid-amprol-ampromed-the-correct-amprolium-dose.73341/
What are those noodle looking things in the photos? Mealworms? That is a LOT of mealworms...