We present the development and implications of using a fine-tuned generative AI chatbot, Estella Explainer Math Bot 2 (EEMB 2), to create math modules for early elementary learners. EEMB 2, integrated with the Usable Math platform, serves as a reading and problem-solving coach for educators and tutors. Our iterative design approach leverages prompt engineering, contextual storytelling, audio enhancements, and human review to ensure age-appropriate, engaging content. This innovative AI-enhanced method has potential applications across disciplines, offering scalable, personalized learning experiences while supporting teacher professional development. Ethical considerations and human-centered design principles are crucial to maintain balance and effectiveness in AI-driven educational interventions.