What is the situation in the hospital? If she is in a place where the doctors and medical system are overwhelmed, that is a different thing than if you're in an area without as many Covid cases. People do survive Covid and the doctors know what kind of treatment works the best, the only variables being her health originally and their resources. People do survive lung infections and also people get disoriented from fever and come back from it. In what country are you?
What you haven't said is how old your mother is, whether she has other health problems that make covid worse, etc. Know that the vast majority of those who get covid do survive. If you live in an area where doctors are up to speed on current treatments and have them available, there are some pretty good mitigating treatments (mostly steroids) and one almost cure if it's given early enough, which are monoclonal antibodies. Many docs aren't giving them or telling patients about them, but if they are given early enough they are extremely successful at treating covid infections. However, they aren't available everywhere, and require a place where you can sit for an hour and get the intravenous infusion. Whether your mother is within the window where this treatment works or not we don't know and also don't know where you are and what the level of treatment is. You might ask her doctor about monoclonal antibodies. All that being said, nobody here can tell you your mother's condition, only her doctors know that as they have seen her and know her health history. We can wish you and her the best. Peace.