Your mom should already have bone metastasis of lung cancer, the cancer has spread to other parts of the body, such as spread to the liver and bones, the medical definition of stage IV, that is, the advanced stage of lung cancer, and need to be timely symptomatic treatment. To put it directly, without active treatment, it will take about 1 year at most.
Symptoms will vary with each patient's physique. Hoarseness is the most common symptom in patients with advanced lung cancer, and almost all patients with advanced lung cancer with regional spread have shortness of breath to varying degrees, and then there is also coughing, cachexia (commonly known as lethargy, poor appetite, and other physical manifestations), and metastasis to various different organs.
Treatment, for advanced lung cancer, is mainly to prolong the patient's life and improve the quality of survival. It is fundamental to go to a big hospital as soon as possible, communicate with the doctor more, find a few more specialists, and develop an effective quality program. As for your comment about mom's symptoms, I understand that it's hard, but that's secondary to the fact that these symptoms can only get better if the cancer cells are controlled. If you can't control the cancer, more pain is yet to come. Gamma knife is not suitable for your mom's condition, besides even if it is suitable, it needs to be combined with the whole body treatment, the cancer cells won't wait for you in one place, if it's so simple, just surgery to cut it off won't be the end of it.
To be more specific, nowadays, the combination of radiotherapy and chemotherapy is the main and most effective treatment for lung cancer. Chemotherapy can kill cancer cells in the whole body, and radiotherapy can control localized lesions and relieve the symptoms of 70% of patients with advanced lung cancer. Of course, the western medical treatment is also harmful to the patient's body while killing the cancer cells, so it is recommended to cooperate with traditional Chinese medicine to support and correct the disease, and also cooperate with chemotherapy drugs of traditional Chinese medicine (commonly known as "fighting poison with poison"). After radiotherapy and chemotherapy, you can also use some targeted drugs, some targeted drugs for Asian, female, non-smoking patients is very good.
Additionally, a cancer patient's diet should be light, with fresh vegetables and fruits. You those big tonic supplements, it is best not to eat. Your mom's body, right now, can't absorb them at all, but let the cancer cells absorb them away (which is also a kind of malignant disease).
I hope it can help you, I think your biggest problem now is that you have not adjusted your mind to positive treatment, patients with advanced lung cancer, the treatment time is very valuable, do not waste time.