She was the daughter of Gerhard VI, Count of Holstein-Rendsburg (d. 1404) and Catherine Elisabeth of Brunswick-Lüneburg.
Due to her age, it is believed that she initially resided in her own house on the convent premises.
Ingeborg worked to install the so-called vårfrupenningen to a regular fee, a goal she succeeded with by permission of Charles VIII of Sweden in 1450, and again from Christian I of Denmark in 1461.
Upon the request of Christian I, she wrote the (C 50, UUB), Fjorton råd om ett gudeligt leverne (Fourteen Advises to live goodly), likely before his visit in 1461.
Ingeborg is believed to have supported the Roman side against Conciliarism and the new Papal policy of Concords and diplomacy, and opposed the national centralism of Charles VIII of Sweden.