My mom has severe co pd and might need a lung transplant. could i give her one of my lungs?

No: Currenlty lung transplants are from deceased donors only.

Unlikely: In order to do a living related lung transplant one needs to have two different donors. Each donor will donate a lobe of the lung and this lobe will function as a "lung" in the recipient. Thus, the surgery is limited to small recipients and usually children who the parents or relatives can provide a small portion of their lung to work as a full lung in the child.