Family members raised the alarm when they could not reach Anna Zukowska, police say.
Nottinghamshire Police says officers are studying mobile phones and CCTV.
Officers were called to a cul-de-sac in Ollerton on Sunday, when a woman was found dead.
If approved, Newark and Sherwood District Council's leader says work is expected to finish by 2028.
Two people were reportedly seen carrying fuel cans to a large tank of kerosene, the force says.
Motorists will be unable to use the A614 Old Rufford Road while "essential repairs" are carried out.
The crossing near Ollerton was closed in 2022 due to safety concerns from Nottinghamshire Police.
The man could have survived had he been given the correct antibiotics, a report finds.
The proposed development includes a three-screen cinema, cafe, public sector hub and housing.
