Did you mention that her crop was empty this morning? How old is this hen?
I doubt that the bump in the trachea is anything critical or she would be gasping for air. Set that aside for now.
If her crop is still like a water balloon, you should be treating for a yeast infection with miconazole vaginal yeast cream. Get it where they stock the menstrual products. Get the cream as it's most cost efficient.
When giving any med to a chicken, it's folly to expect the chicken to "take" it any more than a toddler would. Grasp the hen around the wings and body to control her, and pry open her beak by inserting a finger nail and then hold the beak open with a finger in the side while squeezing about half an inch of cream into her mouth. 2x day for seven days.
If this is impacted crop, and it's often in conjunction with sour (yeast) crop, you will be able to feel the solid material. Use your sense of touch and imagination to picture what the clog is - grass is the usual culprit as chickens will often gorge on sweet spring grass. You will need to treat with oil and massage in addition to the miconazole. The link
@Eggcessive gave you has detailed instructions.