Michelle Miller contributed to the HL7/fhir-extensions repository by delivering two major features and resolving a critical bug, focusing on improving FHIR extension governance and interoperability. She deprecated several extensions, including allergyintolerance-resolutionAge and goal acceptance, to streamline the extension model and align with updated abatement paths. Michelle also expanded workflow extension contexts to cover additional FHIR resources such as CarePlan and Procedure, enhancing workflow relationships and compliance. Her work involved Java and XML, applying healthcare standards expertise to ensure robust API development. The changes restored original compliance behaviors and improved traceability, reflecting a thoughtful approach to evolving healthcare interoperability standards.