Detectives are appealing for witnesses to come forward
Officers found the victim suffering from a head injury in Longbridge Road at around 9.30pm on Sunday, 15 August.
She was taken to hospital and has since been discharged.
It was originally thought only a 56-year-old woman was arrested on suspicion of causing bodily harm but a 36-year-old man was also detained for the same offence.
They were taken to an east London police station and have since been released on bail to return to a date in mid-September.
Detectives are investigating the incident and appealing for witnesses to contact them on 101 quoting CAD 6999/15Aug.
To remain anonymous contact Crimestoppers on 0800 555 111.
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