Thank you for the query.
Your friend is suffering from esophagus
narrowing due to a serious burn of it. Such burn causes an inflammation or even necrosis
of the esophagus. It all depends how deep were the burn.
Some of such patients can recover fully, some will have eating problems and some wont be able to eat by theirs mouth ever.
However there is a lot of possible ways to treat such esophagus narrowing. She may have esophagus widening procedures, endoscopic esophageal stent
insertion. Surgery is rather not possible in such case. The worst option is gastrostomy - artificial tube inserted to her stomach through the skin.
Hope this will help.