You can call your daughter Fatimah without adding any other name to that. But when we mention Fatimah the daughter of the Messenger of Allaah (peace and blessings of Allaah be upon her), we say “Faatimah radiya Allaahu ‘anha (may Allaah be pleased with her), because she was one of the Sahaabah and Allaah is pleased with them.
And Allaah knows best.