She may have died much earlier that we thought, because the records of testaments and inventories after death from Bischwiller, beginning before 1660, do not seem to include any mention of her estate. However, if she had remarried, it might not be possible to identify her even if she were mentioned.
Birthdate computed from date of death results in 29 feb 1853, so some sort of error was made in preparing the tombstone. If the age at death, 28 years, 11 months, 16 days, was calculated by "inclusive counting", such that 14 feb 1882 was counted as a full day, the error is even worse, implying a birth date of 30 feb 1853.
