The 3rd child born to my 2nd great grandparents, Sigri Gunnersdatter and Ole Larson was Marta Olsdatter. Here is the Ullensvang parish record of her baptism (#66).
Marta was born May 13, 1855 and baptized June 10, 1855. Looking in the right hand column, there was a Marta in attendance and using the Norwegian naming patterns, it would appear to be Marta Olsdatter's maternal grandmother. The last name is difficult to read, but it appears to be Marta Torbjorsdatter.