FamilySearch.org offers an alternate spelling of her maiden name: Engstler.
Maria married three times. Her first marriage, in 1734, was to last until Nikokaus Buffehr's death in 1756. Their children (including variable last name spellings) are: Marae Magdalene Boffier, born 1735; Anna Barbara Bouffier, born 1738 (died in infancy); Andreas Buffer, born 1742 (died in 1744); Maria Catharina Buffer, born 1745 (died in infancy); Andreas Buffehr, born 1746; and Anna Maria Bouffier, born 1749.
She married Johann Peter Wilhelm September 11, 1757. He died the next year.
Lastly, she married Johannes Heisler on May 18, 1760. He died in 1764.
The date of her death is unknown.
https://www.familysearch.org/tree/person/details/LZB3-WNN
Pg 54, family 1, Die Familien Von Bann une Queidersbach, 1710 - 1925 by Otto Linde'mer.
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