This study seeks to improve mental health, pregnancy, and HIV outcomes among pregnant and postpartum women living with HIV with common mental health disorders in Kenya. The investigators will tailor a collaborative care model for peripartum women with HIV experiencing mental health symptoms and evaluate its impact on participants' mental health, antenatal, and HIV care outcomes. The investigators will actively engage key stakeholders throughout the process and assess scalability and sustainability through multi-method approaches. This study will contribute to the overall goal of achieving optimal health outcomes for women living with HIV and their families in sub-Saharan Africa.