Murder cops have launched an investigation after the tragic find in Hounslow yesterday afternoon.
The woman was related to the girl, police say.
Detectives don’t believe anyone else was involved in the deaths.
Officers and paramedics were called to an address in Old Meadow Lane just before 4.10pm.
Both the woman and the child were pronounced dead at the scene.
“Next of kin have been informed and are being supported by specialist officers.
“An investigation is under way led by detectives from the Met’s Specialist Crime Command (Homicide).
“While the investigation is still in its early stages, officers do not currently believe anyone else was involved in this incident.”