Lymphoma and Lung Infection

My Mom had Lymphoma and also contacted some type of Lung infection that might take her life. She was to have 6 Chemo treatments but had a hard time breathing she has been on Oxygen for the last month. The Dr. say that they don't know what it is. My mom is on a ventalator and we were told the other day that she is not getting better so they want us to have them take her off the machine. She is 74 and was in good health till the Chemo got a hold of her and this infection. Any help ? sure could use it. A very sad Son