Hi1
Welcome to HCM!
You must take your mother for CT Scan.
As per the problems mentioned in your question and the chest x-ray findings, I am of the opinion that your mother might be having a tumor ( suspected to be a malignant)..This tumor is known as
Pancoast tumor which typically develops in the apex of the lungs it rarely causes symptoms that are typically related to the lungs (e.g. cough,
chest pain).
The initial symptom is pain in the shoulder, inner part of the
scapula (large, triangular, flattened bone that lies over the ribs on the back), or both.
The pain may later extend to the inner side of the arm, elbow and the little and ring fingers as a result of damage to the afferent pain fibers of the sympathetic trunk.
This cancer can develop in non smokers.
Risk factors include prior prolonged asbestos exposure, exposure to industrial elements (eg, gold, nickel),
smoking, and secondary smoke exposure.
These tumors are effectively managed by
Chemotherapy, Radiotherapy with Surgery.
Kindly consult your GP for further management.
Wishing your mother a speedy recovery from her illness.
Regards!