I'm so sorry about your hen
@merceme57 . I agree with
@Wyorp Rock , I think speaking to your vet would be best, it sounds like there may be a puncture or tear in the trachea or crop which may need to be repaired, thus the leaking and bubbling. It would need to be closed up separately from the skin over it. My concern with tubing at this point would be the risk of making it worse depending on where it is and how large it is, so I would proceed with caution there and go slowly. Repairs can be done depending on where and how it's torn, so it's not necessarily hopeless. But sooner would be better than later so that infection doesn't set in. Antibiotics are good, but if it's leaking then it will continue to be contaminated with what ever she swallows.