Kim,
Words can't even express how ticked I would be if someone treated my mom that way. I feel for you, having to deal with that on top of your mom's medical concerns. Luckily for her, you seem to be a powerful advocate for her.
My mom has COPD as well, but she is not near end stage. I wish I could offer more help. I know that sometimes it is almost frustrating, trying to determine which symptoms are COPD / emphysema related, and which are the cancer.
I hope this gets better for you. Your mom is lucky to have you there, helping her out.
Kelly