I inferred you are referring to the story entitled 'Hidden Figures'.
Answer:
She experienced prejudice and racism
Step-by-step explanation:
Remember, when she was sent to the East Side to work on a project alongside white members of staff, they expressed racist remarks on her when she asks the location of the bathroom.
In fact, they even laughed at her, saying they don’t know where the "Colored bathroom is". Thus, Mary was segregated in her workplace simply because she had a different skin color.