#chicken choking

My chicken is experiencing severe choking. I've examined its mouth, administered water and oil through a syringe, but it's still struggling. What further steps should I take? Here's a link to the video

My chicken is around 10 years old. It is wintertime and she has not been eating much, she will not eat her hen food and will only eat certain foods on her own. She had even started losing weight. I have been hand feeding her more food like egg and peas by pushing small pieces into her mouth and...