In the novel They Came to Baghdad, Miss Ankoumian is a young Armenian woman hairdresser in Baghdad. Catherine Serakis introduced Victoria Jones when she needed a shampoo.
It turns out that Ankoumian is an operative working to bring about "The New Order". While giving a shampoo, she chloroforms Victoria so that she could be kidnapped and taken away. Although it is not mentioned, she is also likely to be the one who dyes Victoria's hair, transforming her from a brunette to a platinum blonde.