I assume you've seen the information at OneWorldTree on ancestry.com (you may have put it there!). It doesn't say where in Sweden she was born.
Name: Clara Josephine DAHLGREN Sex: F Birth: 1851 in Sweden Death: 2 FEB 1931 in Chicago Il
Marriage 1 Franz Frederick SANDSTROM b: 14 JUL 1841 in Sweden * Married: WFT Est. 1863-1888 in ? Children 1. Franz Frederick SANDSTROM b: 17 MAR 1872 in Chicago Il 2. Mary C. SANDSTROM b: 10 JUL 1874 3. Clara Josephine SANDSTROM b: 22 OCT 1876 4. Charles Andrew SANDSTROM b: 1884