(Please help) My chicken is gasping and has foam coming out her mouth

Pics
She's been having these symptoms for many months. I tried antibiotics for respiratory disease but it didn't get rid of the symptoms. Her upper neck below her beak feels swollen. Is it gapeworms or anything else? The video of her gasping is in the link below. Thank you.

https://streamable.com/9i7o92
I’m so sorry. Not familiar with this. I hope you can solve the mystery.
 

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