I am a Homoeopath trying to answer your question in a different way through Health care magic . If you can specifically say that all the chest problems started from a specific time like August, then her mental condition just prior to August becomes important. She must have had a mental conflict from the period of which she started the cough
etc. Try to explore this and approach an expert Homoeopath for taking her mind and body symptoms in detail and give her a Homoeopathic remedy which can easily remove her ailments. Please do not give her any more chemo drugs which will further deteriorate her conditions.
Homoeopathy does not treat her cough but treat the patient. Once she is cured her cough, chest pain
etc also will be cured.