I reached out to National Trust Collections regarding the year of death that is on their website for Mary Wotton, which is listed as 1535.
Above is a current screenshot of their website.
Below is her burial plaque at St. Mary Churchyard in Devon, England. According to this burial plaque, she died in September 1558.
I have received a response from the National Trust Collections stating, "We shall raise the matter with our counterparts in the collections team who will be able to investigate and update their records accordingly."
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