In 1941 she made Aliyah to Mandatory Palestine on the board of the ship "Darian 2" and was arrested by the British Mandate's authorities for being an illegal immigrant.

She joined the Lehi Jewish militant underground, and served as liaison for Yitzhak Shamir, the organization's commander.

During her imprisonment in the women's prison in Bethlehem, she went on hunger strike for 11 days demanding to be reunited with her toddler son.

Shulamit Shamir's activity reached pinnacle in the efforts on the Senior Citizens Law enacted in 1989.

After some time she was invited for another visit there to participate in an international symposium on the rescue of Bulgarian Jews during the Holocaust.

It was alleged that she acted for the appointment of Yosef Barel as CEO of the IBA and that she was behind the ending of the TV show Ze ha'zman due to the political statements of presenter Ram Evron.