According to your description it seems that your sister has severe achalasia and surgery would definitely be beneficial for her. She has already undergone dilatation twice and her symptoms have recurred. You can even try botox
(botulinum toxin) injections but they are not a long term solution.
Surgery (Heller's myotomy
) is the most long lasting solution in this case. This surgery can be performed laparoscopically these days and is usually clubbed with a fundoplication (myotomy - they given an incision in the muscle of esophagus
to facilitate the passage of food, but this can sometimes lead to some heart burn and so they club it with a surgery to prevent reflux/ heart burn).