The victim, believed to be in her 30s, was walking on the pavement in Bere Regis, Dorset, on Friday.
A red Land Rover had been travelling along the C6 Southbrook road to Wool in the village when its trailer detached, colliding with the group.
The 44-year-old male driver of the Land Rover, from Wareham, has been arrested.
Police said he was being held on suspicion of causing death by dangerous driving.
The victim, who has not been identified but was from Bere Regis, died at the scene.
The other woman and her child were taken to Dorset County Hospital where they were described as being in a stable, non-life-threatening condition.
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