In addition to checking the crop (and feel around carefully to see if you feel anything that might be a foreign object), I would also, if you didn't do it before, have someone help hold her and use a flashlight and get a really good look in her throat, just to be safe. The wheezing and crackling could be something stuck, aspirated, or a respiratory disease that is causing a partial obstruction, maybe from swelling. If something is stuck, then often they can dislodge it with a bit of time. Other than that, if it persists with no other symptoms then vet care would probably be best, if that's an option.
