What I loved: This does a really great job of describing the way it would feel to have anxiety in terms a child could understand. We also understand Gloria's grief that her family does not believe her, not an uncommon situation. The images are descriptive and full of color. The length of the book is leaning towards a chapter book, and as such, this would be better for older picture book readers.
What left me wanting more: The book does not do a great job of showing how to treat anxiety. It would be helpful to show an approach of getting therapy or help from a counselor or something along those lines, to show children that they can get help if they need it.
Final verdict: Overall, GLORIA'S BIG PROBLEM does a good job of describing what it feels like to have anxiety in terms children can understand, complete with colorful illustrations. When reading with children, it would be helpful to discuss how anxiety can be treated and what resources there are to help.