I have a 3 mo old red sexlink chicken with what I believe is sour crop. I have been massaging it, "burping" her but the swelling has not gone down. I have only been feeding her hardboiled egg yolks with yogurt. Should she be getting something else? Should I be feeding her anything until I know the crop is empty? (I'm a brand new chicken mom & I'm panicking a little!) Thanks for any help you can offer!