Gladys Richards' daughters, Gillian Mackenzie and Lesley O'Brien, have campaigned for several years for a full inquest to be held into her death.
Mrs Mackenzie, 79, of Eastbourne, East Sussex, has questioned during the Portsmouth inquest whether the medical staff operated a policy of euthanasia and has accused the staff of "condemning" her mother to death through the palliative medication prescribed.
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Five men who died in the water off Camber Sands were friends who had arrived to spend the day at the beach together, ITV News understands.
Helen Plint has the weather forecast for the west of the ITV Meridian region.
Helen Plint has the weather forecast for the east of the ITV Meridian region.