Advanced stage lung adenocarcinoma.

My mother is suffering from advanced(stage IV) Lung adenocarcinoma, she was diagnosed in December 2024 with metasis to liver and bones and she was further put on targeted therapy as it was EGFR and TP53 mutated- Osimertinib and Chemotherapy and it worked and resulted clear PET CT scans until recently . After a year of diagnosis, recently in May 2026 she went through PET CT scans following a swallowing difficulty and it was found that the cancer had become active again(not at the primary site) at the either side of the hilar nodes and in the esophagus (outer part not inside) now doctor has recommended Amivantamab and carboplatin chemotherapy. I want to know if this will work as she is havina a lot of complication while swallowing food and is having purely liquid diet. For how much time will it be effective? Doctor has said 1yr so really one yr or it depends? Is the line of treatment that is being followed ,correct ?