Brutally honest question: Stage four cancer is terminal right?

Most stage 4 cancer is deadly and can’t be cured. Some girl posted on her that her mother has stage four cancer and she believes her mom can fight this. I’m glad she had that positive mindset BUT she won’t accept that her mother is dying and can’t accept that it isn’t curable. I’m no sorry for what happened but I feel bad for her but she should have her mother suffering. She can’t get upset at this stuff because shit happens for a reason and she had to accept death is part of life. How can I get her to accept that stage four is terminal? She never mentioned about that. I’ve never heard of someone surviving stage four cancer. Sorry to sound harsh but it’s incurable.