If this is her husband's will and probate, then she was not dead before 1617.
https://www.ancestry.com/discoveryui-content/view/35769:1900?ssrc=p...
Find A Grave notwithstanding, which is often wrong on details. There is a Tenterden Cemetery, which is appears not to be the the same St. Mildred's.
https://www.findagrave.com/memorial/91114173/alice-tilden