Katie Caught a Cold by Charlotte Cowan, illustrated by Katy Bratun

From chapters.ca:
In her story for children ages 4-8, Dr. Cowan empathizes with children who are feeling miserable with a cold. She understands about their stuffiness and sneezing, feeling tired and thirsty. In Katie Caught a Cold Dr. Cowan illustrates the comforting care that can help children feel better and thus reassures both parent and child.