Mary Thielen ¹

  Things to check:

This may not be the correct individual: the 1910 U.S. census says that Lucy Thielen was the mother of 4 children, of whom 3 survive. In 1900 she is the mother of 3, so presumably the fourth child was born and died between 1900 and 1910. Mary is the only Thielen who was born and died in Ramsey County during that period.