A very thorough catalog of all persons buried at the Old Salem Burying Point / Charter Street Cemetery was recently published and Ann Foster is *not* buried there. See Fury, Daniel, "If These Stones Could Speak, The History and People of The Old Salem Burying Point"
See also https://salemwitchmuseum.com/locations/ann-foster-home-site-of/ "It remains a mystery where Ann Foster lived in 1692, or where her remains are buried. There is a lot of conflicting information. Ann’s husband, a Scot named Andrew, was one of the “original proprietors of Andover.” He died seven years before the witchcraft hysteria took hold, in 1685, at the reported age of 106 years. In his will, he said he was “leaving to my deare and loving wife Ann Foster, the use and the sole liberty of living in that end of my house I now live in.” Where was that house? According to Charlotte Helen Abbott’s Early Records of the Foster Families of Andover, “Under the grandstand at the track at the Richardson training stables on Elm Street, is the site of what was known as the “witch’s cellar,” a part of Ann’s home.” However, according to the Plan of Andover in the Province of Massachusetts Bay, Essex County, 1692, a map created by the Andover and North Andover Historical Societies in 1992, the accused Sarah Wilson is more likely the “witch” whose cellar stood near the stables grandstand. It is Joseph Wilson’s house that is located on the map at the spot where Merrimack College meets Route 114 today.
Also according to the Plan of Andover, one of the Foster sons lived north of Foster’s Pond in 1692. While the Plan of Andover identifies the son as Andrew, the Foster’s Pond Corporation says it was son Abraham who lived there. It was Abraham who “had to pay £2 10s to get his mother’s body from the prison” when she died in December, according to Charlotte Helen Abbott. Perhaps Ann Foster lived with her son north of Foster’s Pond, and perhaps she is buried there. The pond was named after her husband Andrew, according to the Foster’s Pond Corporation. In 1692, it was much smaller in size, covering approximately 50 acres. After a dam was built in the early 1850s, the pond started to increase in size. Today, its area has more than doubled, covering 120 acres.
Another theory about the location of Ann Foster’s final resting place is suggested by Char Lyons, historian of the South Church in Andover. She points out Foster Circle, off of Elm Street, as an area once owned by the Foster family and a possible location for Ann Foster’s burial place."
