Police name a 15-year-old girl and her mother who died after drowning at a beach on the Essex coast. According to the reports, the incident involved the pair getting into difficulty in the water. Emergency services respond after concerns are raised, but the two are later pronounced dead. The girl and her mother are named by police, with the authorities also calling for privacy for the family as they process the loss. The information provided across the sources focuses on the identification of the victims and the circumstances described as the pair getting into trouble at sea. Further details about what led to the difficulty in the water, including whether any witnesses saw what happened or the specific conditions at the beach, are not included in the supplied excerpts. Police continue with the next steps following the deaths. The reports treat the case as a drowning incident on the Essex coast and do not indicate any other parties being involved.