No.1 keep her off the grass and on Soft foods for a few days till you know for sure the obstruction has moved. If there is a blockage in there grass which has been found inside Carl's blocked crop twice during surgery is not something you want to add to it at the moment.
No.2. If you see she is still eating dirt the obstruction hasn't moved, that's always an early sign Carl's crop is blocked. keep her away from dirt and just give her a small amount of food that has been moistened with water first so is more easily digested. A day of no food won't hurt her so keep it small to assist that crop to empty and not get compacted.
Agreed, and be sure she has acces to clean water. If it's a physical blockage unfortunately molasses , Epsom salts and olive oil are pretty much redundant. Surgery is usually the only answer unless you catch it really early on in the piece. Let us know what the vet finds.