I’m glad her crop went down! Sounds like she’s doing better then?
I know you’re really concerned about her, but I agree with wyorp rock, I dont think I’d risk vomiting her. About a week is what I’ve experienced for crop issues to clear up, so it does take time. You said her crop has changed size today, that is good, she may just need some more time to get things moving.
Combs change color/consistency (for lack of a better word) for multiple reasons, including dehydration, hormones, temperature, excitement, illness. She just isn’t feeling well, it fits her comb has flopped a bit.
I know she is stressing you out, but give her some time; you’re doing everything you can at the moment.