Is there any book anywhere that couldn't be in need of a trigger warning? Think about Twilight or Lord of the Rings or The Great Gatsby. What would be helpful is for professors to do what many I know already do: ask students at the beginning of a class to inform them privately if they have any issues that might interfere with classroom learning and proceed from there.
Mayra Arce even resembles Esperanza, the protagonist in The House on Mango Street, one of the 80-plus books that were part of the Tucson Unified School District's K-12 Mexican-American studies curriculum before the program was dismantled under Arizona House Bill 2281. But Maya isn't the main character of a book. She's the main plaintiff in the lawsuit against Arizona.