My grandma might get sick. Please help?

I have some allergies right now because it has started raining and the temp has cooled by like, 20, and lately my gma has been..fragile. Plus she works at a community college where there are sick people all the time. She has raised me from the time I was a baby. She's helped me through so much. If she gets sick she could die! She's never been this bad. I've had to help her get dressed and stuff and she hates that but she hurts too much to do it by herself. My question is this. What can I do to keep her healthy? What can I do to prevent her from the worst outcome? She's only 65! I don't know what I'd do if I lost her so pleeeease. If you have any kind of like, tea recipe or food or vitamin that could possibly help her feel better and be able to be more independent I'd love to hear. Thank you so much! (Not that I don't love to help her because I do. I'm way more than willing to help her any time she needs it.) Thanks!