The combs are very large and colorful for that age. The other chicks in that photo show very little if any signs of color on their combs and their combs are still very small.
I think I am seeing white chest feathers indicating a pullet. However I would wait another week for the feathers to come in more as any black chest feathers would be a 100% cockerel.
I have a hen with a similar situation (reproductive issue). At first she used to crow every morning and throughout the day for around 3 months but after a bit she has only crowed sometimes. She shouldn’t be loud in the fall and winter and she should quiet down over time. I also wouldn’t get rid...
I had a hen in a similar situation with your hen and she had an egg brake inside of her. She died in less than 4 hours. If you have a fellow chicken person willing to open up your hen, you can get a confirmation of that. Otherwise I am unsure of what it could be.