[3] de Courrière was interested in occultism and found herself involved in a Black Mass affair that nearly went awry and earned her a month 's stay in a psychiatric hospital.

It turned out that de Courrière had spent the night of 7 to 8 September at Moerstraat 36, the house of Canon Louis Van Haecke, rector of the chapel of the Holy Blood and alleged exorcist.

She had to be interned a second time in Brussels in 1906,[2] and she wrote a violent booklet, Nero Prince of Science,[6] against Jean-Martin Charcot, which is characteristic of the hatred that patients sometimes devote to their psychiatrist.

These are only chasubles, altar cloths, objects of worship adapted to the most unexpected destinations, monstrances, corporals, dalmatics, candelabra with multicolored candles, mysteriously lit in corners of shadow, near a superb lectern on its wings works by Félicien Rops or the Marquis de Sade.

[8] In 1889, Gourmont presented de Courrière to Joris-Karl Huysmans who based the character of Mme Hyacinthe Chantelouve in his novel Là-Bas (1891) on her.