I appreciate the interest you are taking in your aunt's recent diagnosis. I know how difficult a diagnosis of metastatic carcinoma can be. How was her diagnosis confirmed? Is she interested in seeking a second opinion at a Mayo Clinic? There are three Mayo facilities in Minnesota, Florida and Arizona. The best way to find out if she is a candidate for further treatment would be to call for an appointment. Here is information regarding making an appointment: https://www.mayoclinic.org/appointments
We have had many Members here on Connect who have sought treatment and help at Mayo. I would encourage you to read some of their posts at the following links, https://connect.mayoclinic.org/group/lung-cancer/. Here you will see many discussions relating to lung cancer.
Is your aunt currently in a lot of pain? How is her breathing?