I don´t know,I´ve heard/read that both Grace Kelly and Rita Hayworth were rather unhappy in their marriages and they didn´t like being a princess because it came with so many limitations and they were not allowed to make any films.Grace Kelly loved her job as an actress a lot but she was just expected to look pretty and give birth to an heir when she was in Monaco.Not only was she kept from filming,her movies were also not shown in Monaco because it was not seen as "proper" for a royal princess...
From Wikipedia: After the wedding, Prince Rainier banned the screening of Kelly's films.
[15] Hitchcock offered Kelly the lead in his film
Marnie in 1962. She was eager, but public outcry in Monaco against her involvement in a film that portrayed her as a kleptomaniac made her reconsider and ultimately reject the project. Director Herbert Ross attempted to lure Princess Grace for his 1977 film
The Turning Point, but Prince Rainier quashed the idea.