The 20-year-old victim was abducted from her home in Brownlow Road shortly after 7am on Monday.
She was found dead in an abandoned car around 90 minutes later.
Officers arrested a 19-year-old suspect after a major manhunt at about 1pm in the Hackney area, Scotland Yard said.
Neighbours said they heard a "hysterical" scream come from the property and a cry of "Please, please, please" before she was taken away.
Police said Ms Treloar, who gave birth to her first child last month, had died from stab wounds.
Two other people inside Ms Treloar's house - a 22-year-old man and a 24-year-old woman - also suffered stab injuries in the ordeal.
Ms Treloar's month-old baby girl was also inside the home but was not hurt, police said.
Friends and family have left tributes for Ms Treloar on Facebook.
"RIP kirsty my thoughts are with ya family and your baby girl xx," wrote Kerry Louise Clayden.
While friend Shanaye Donavan posted how Kirsty had "such a good heart" and was "truly someone special".
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