Maureen Buchanan (80) died in the crash which occurred between junctions 9 and 10 countrybound last Friday.
Six vehicles were involved in the crash, which also led to hours of congestion on the M1.
Senior investigating officer Inspector Alan Stewart said: “I am extremely keen to hear from anyone who witnessed the events that sadly led to the loss of Mrs Buchanan’s life.
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“She was the rear seat passenger in a silver Honda Jazz car that was involved in a six vehicle collision at around 5.35pm.
“The other vehicles involved were a grey Chevrolet Aveo, a red Seat Leon, a white Hyundai i10, a grey Audi A4 estate and a blue Vauxhall Zafira.
“We are investigating the exact circumstances of the collision and we would like to hear from motorists who witnessed what happened or anyone who believes they may be able to help our investigation in anyway.”
The investigation team can be contacted at the Collision Investigation Unit by calling the non-emergency number 101.”