Dysphagia and vomits. Small vomiting!

My mother is 65 years old and is affecting from severe dysphagia not able to digest solid at all. When she sleeps, water comes to her mouth and she has to spit it.. It happens twice or thrice during the night. She had a surgery last year where her gallbladder was removed as there was a stone in it.. Her uterus was also removed as there was some doubtful cells on the uterus lining as doctor mentioned which could be cancerous. So he removed both gallbladder and uterus. Now she is on ayurvedic medicine since then. She takes warm water every morning and had stopped dairy products.. Except little tea during the day.. She has a habit of chewing supari (the betel nut piece) since many years. she is unable to swallow even the mild solid foods in an apt manner and feels like the food is roughly going inside scratching the walls of the esophagus and stuck in between thereafter. she is usually getting cough while eating and most importantly, she is getting bubbles along with small vomiting