It takes time. I was dosing my bird twice daily. Gentle crop massage can help, too. Can you post a photo? I wonder if she’s a candidate for a crop bra.
Also, just a heads up, often a slow crop stems from other issues. I would keep treating it, but also be aware it’s possible the crop issue is...
The article by @azygous is wonderful. There is another great article by @TwoCrows I think, too.
Please don’t vomit your chicken anymore, as it can be very dangerous. I have had success treating sour crop with clotrimazole antifungal vaginal cream