how does the writer in the Winslow boy use the characters of Catherine to show the attitude of early 20th century society towards suffragettes?

Catherine is Ronnie's sister and is very protective of him. She is a combative woman who is a suffragette, and participates in many protests trying to fight for the right to vote for women. She does not doubt her brother and is keen to get involved with his case. She even does a little investigation of her own. Catherine's life is affected very detrimentally because of the entire debacle surrounding her brother's case. Her fiance ends their relationship because of pressure from his father, who is a military man through and through and automatically believes the military to be in the right come what may. She is aware that she needs to marry and resigns herself to marriage to Desmond Curry, her family attorney; she doesn't love him but she knows he is fond of her, and knows he will be a good husband. She ultimately ends up in a budding relationship with barrister Sir Robert Morton, whom she initially doesn't like and doesn't trust, but ultimately comes to respect, and finds that an attraction blooms between them.