She attended a boarding school in Paris. She studied singing, music and drama at the Prague Conservatory.
During the silent and talkies era of the German cinema, she appeared in several movies as a supporting actress. When Adolf Hitler came to power, Forescu, like other Jews of that period, was barred from her profession. She died in the Buchenwald concentration camp in Germany.
She also performed in several of the tours organized by the theater throughout Europe.
Then she went to Berlin, where she appeared at the theater of the West, at the Operetta Theater, and the Metropolitan Theater. She made her film acting debut in 1911 with the Charles Paulus-directed Die Pflicht.
She left singing in 1915 to concentrate on her film acting career. She mainly appeared as a supporting actress.
She had played the character of Yelina in the crime film Marizza, genannt die Schmuggler-Madonna.
The most popular films in which Maria Forescu acted were the Gerhard Lamprecht-directed Zwischen Nacht und Morgen and the Hans Behrendt-directed Danton (both 1931). In the 1929 film Der Sittenrichter. 218. Eine wahre Begebenheit, Forescu played the woman who aborted the heroine"s child.
The film was considered controversial for depicting the topic of abortion.
She also starred in the 1920 silent film The Women House of Brescia. The film was rejected by the British Board of Film Classification.
In 1932, after filming Das erste Recht des Kindes (directed by Fritz Wendhausen), her career was cut short by the new laws made by the Nazi party. She was deprived of living a respected life and was prohibited from engaging in any professional activities.
Forescu who was of Jewish origin was expelled from the Reich Student Council film in 1938.
After the expulsion and the rising hatred against the Jews she took refuge with Maria Hirschburg on the Motzstrasse in Berlin-Wilmersdorf. She died in the Buchenwald concentration camp on 23 November 1943. Throughout her career she had acted in approximately 160 films.
Around the turn of the century, she debuted as an operetta singer and soon became a well known member of the renowned Viennese Carl Theater.