Didusenko has launched legal action in London claiming Miss World organisers are breaching the terms of the Equality Act of 2010 that protects against discrimination based on certain characteristics, including marriage, maternity and gender.
There has not yet been any comment from Miss World on the issue.
This year, the Miss World final will take place in London on December 14. Ukraine will be represented by Margaryta Pasha, a law student.
Miss World is the world’s oldest beauty pageant, first held in Britain in 1951.