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These features are highly suggestive of obstruction of the food pipe (oesophagus).
You have not mentioned her age or habits.....
With advanced age, cancer is the common cause.
In younger people, stricture is common.
Occasionally, there are other causes like disturbed motility and so on.
The only way is to do an Endoscopy
(A tube is introduced through the mouth down to stomach and beyond).
Earlier it is done, better it is for the patient.
Wishing speedy recovery