Ok firstly you shouldn't get that flu so try to not to stay too much in a room with your mother or open a window of that room. Do not stay too much near of your mother. Wash your hands all the time. For your mother, she will say "I am freezing, I want to be warmer." but dont listen to her. This is for her sake. Get her a cold shower.(Not too cold of course) You have to get low that temperature. After that she has to lay to bed and dont let her to take too much things onto her when she is in bed. If you can, make a soup for her. She has to get a pill that is used for fever too(I couldn't remember the english word of it so I explained the pill like that). Probably she has to take antibiotics too but dont give her antibiotic before going to a doctor.