Police were called on Tuesday December 19 at 12.27am following a collision between a pedestrian and a HGV.
The deceased, from Millom, was formally identified as Tatiana Grieve.
The driver of the HGV was a 54-year-old man from the Leeds area.
Police are appealing for anyone who may have seen Mrs Grieve or her vehicle, a silver Toyota Rav 4, on the M6 just south of junction 36 at approximately 12.10am.
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Anyone with any information is asked to email [email protected] or call 101 and ask to speak to PC 2190 Batley quoting incident number 4 of the 19th December.