Be careful massaging the crop with grit in it. You can get some slices and nicks inside that can get infected. Once you've emptied the crop of the first bad goops and begun treatment, don't worry about emptying/vomiting again unless it becomes engorged again. Chickens can't naturally vomit so you are forcing something unnatural. She needs to process some of her food for the nutrients. Consider babyfood meat as another protein food option. Make sure the veggies you are giving her aren't too much fiber and are not sweet. Scrambled egg, yogurt, baby food meat, vitamins, electrolytes, ACV, water. Be strict until the problem is resolved.
So long as the food is very soft, you can get away with no grit, but grit is necessary for proper digestion otherwise. (It's a bird's teeth!)
That poop looks pretty normal for a bird that ate lots of watery veg. Just extra watery, otherwise pretty normal looking IMO.