Will this help with the flu?

My grandma who is 75-6 years old is sick with the flu or has a cold.The doctor gave her nice medications but she takes vit. C tablets twice a day and she is drinking hibiscus tea and wild thyme tea and she doesn't go anywhere,she stays at home and rests.Will this help her? I'm kinda scared because she's old... but I think she'll be okay...Right?