Probably that of her mother as she was named after her mother.
To the contray, Mary Elizabeth Legg did not die until 1973 so the error is in the death date data field rather than any confusion with her mother.
https://www.findagrave.com/memorial/53448257/mary-e-bennett
My post above was in regard to a conflct notice that a residence was listed after her death. You are correct in your reply. Thank you.
