I searched for Anna Sjöstedt on Ancestry.com and this is what I found:
Name: Anna Sjöstedt Birth Year: abt 1858 Gender: Kvinna (Female) Place of Origin: Winköre Västra Götaland Län, Sverige Destination: New Bedford Record Date: 14 apr 1882 Port of Departure: Göteborg Database Name: EmiHamn Archive Call Number: 19:531:15358 Principal Person: Sjöstedt Anna (Source: Ancestry.com Database: Emigranten Populär, 1783-1951 Swedish Emigration Records, 1783-1951)
She is likely your ancestor though it could be another woman fitting the same description. HTH though.
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