She was educated in singing by the singer Christoffer Christian Karsten, in piano playing by the composer Georg Joseph Vogler and in drama by the actor Jacques Marie Boutet de Monvel.

Being a member of the nobility, she was not professionally active as an artist, but she demonstrated her talent in social life at court and high society and cultural circles, and attracted attention for her abilities.

Reportedly, the marriage was a purely practical affair, as Ehrenström was an old friend of her family and she was forced to think of her future, as her family was not wealthy and she needed to marry to support herself: her spouse, on the other hand, had been appointed commandant of Gothenburg and needed a wife to handle the representational side of his position, as he had recently divorced his first wife Maria Charlotta von Scheven for having eloped with their adoptive son.

A selected part of her memoirs were translated and published by Henrik Schück in 1919 under the title Den sista gustavianska hofdamen ('The last lady in waiting from the age of Gustav III').

Marianne Ehrenström is portrayed in the novel Pottungen (Chamber pot child) by Anna Laestadius Larsson from 2014, in which she, alongside Ulrika Pasch, Anna Maria Lenngren, Ulrika Widström, Jeanna von Lantingshausen and Sophie von Fersen, becomes a member of a Blue Stockings Society organized by Hedvig Elisabeth Charlotte of Holstein-Gottorp.