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Internet of Things safety systems for women combine a distress trigger with location, cellular communication, local feedback, sensing, and increasingly camera or machine learning functions. Published prototypes demonstrate compact emergency alert devices, yet many studies stop when a message, coordinate, or image is generated. They rarely examine how an alert enters medical care, confidential counselling, legal assistance, or ambulance response. This structured narrative review examines representative peer reviewed work published from 2019 to 2025, current IoT and data protection standards, and authoritative guidance on survivor centred and coordinated services. The synthesis organizes systems by activation, localization, communication, evidence, cloud response, service referral, authorization, and privacy. A dependable design needs parallel device workflows, immediate acknowledgement, bounded retries, fresh evidence identifiers, delayed location follow up, secure device identity, restricted media access, and explicit retention. The service layer must preserve survivor choice and separate hospital, counselling, legal, and ambulance workspaces by role, organization, assignment, and consent or emergency authority. The paper proposes a reference architecture and an evaluation framework that covers both technical delivery and accountable service handoff.