She was the only daughter of Henry of Berg, Lord of Windeck and his wife Agnes of the Marck.

Margaret and Otto had a daughter, Margaret, who in married Duke Gerhard VI of Jülich in 1338 Otto IV died in 1328, and as he had no son, Ravensberg was inherited by his younger brother Bernard.

When Bernard died childless in 1346, Margaret's daughter inherited the County of Ravensberg.

She is not mentioned in 1346, when her daughter inherited the County, which would suggest that she had probably died already.

[1] When Margaret's brother Adolf IX of Berg died childless in 1348, her daughter inherited the Duchy of Berg.