Chest pain and throat burn. Please help.

Last year one night my mother had pain in the chest and liver hardened. All the tests were done and it was found that there were small stones in her gall bladder. Sometimes she had pain and throat burn 3-4 times a day. And after 2-3 months everything became normal. The condition restarted in May 2017. Similar symptoms. Also heart checkup was done and it was normal. She had her gall bladder removed on 4th July 2017. Then it was normal again for a month. Now again she has started feeling the same symptoms, chest pain and throat burn 3-4 times a day for few minutes. Mostly when she goes out for a walk in the evening. I guess gall bladder stones were a side effect of other problem which is related to liver. That's why the problem still persists. Although the liver hardening went after 2-3 months of first attack and after that no such problem shown. Please help.