She has yet to be found as search and rescue operations continued on Friday.
The victim reportedly alighted from a car and jumped into the lagoon after an argument with her fiancé on the phone.
The Permanent Secretary of the Lagos State Emergency Management Agency, Dr Olufemi Oke-Osanyintolu, in a statement on Thursday, said the driver of the taxi claimed that she was having a heated conversation with her fiancé before alighting from the car and jumped into the lagoon.