Why do Elliott and Maribel need to make gluten free pies?

Maribel needs gluten-free pies specifically because she has Celiac Disease, which is a medical condition that requires individuals to avoid gluten entirely in their diet. This condition can cause severe health issues when gluten is consumed, making it essential for her to have safe options available. Therefore, the primary motivation for Elliott and Maribel to make gluten-free pies revolves around Maribel's dietary restrictions and health needs, rather than other reasons such as selling them for a fundraiser or preparing for an event.