The social position of servants has been brought up in earlier posts to this thread.
In the social structure of that period the position of a lady's maid or manservant was considered a bit low. I would imagine that would apply as well to a chauffeur, gardener and a cook.
But in the case of a governess or a secretary, there was a different feeling. These were considered acceptable positions of service to be "admitted" to society gatherings - perhaps not the choicest, but to intimate gatherings at least. In Europe a governess would have been considered part of her employer's family and a secretary would have known about his or her employer's business and financial situation so they were also thought to be on a par.
It was not always the case but governesses and lady secretaries often came from "respectable" families themselves.
I don't know what the attitude was toward the governesses on Titanic (I can't recall how many there were) but the one woman secretary aboard, Laura Mabel Francatelli,
Lucy Duff Gordon's business secretary, was not excluded from social interaction and in fact accompanied her employer wherever she went. "Franks," as she was called, was as much of a companion and friend as she was a secretary, a sort of "lady in waiting."
Throughout her years working for Lucy, Franks was often pressed into service as a veritable emissary, even presenting talks and holding conferences in her employer's behalf. She was relied on not only as a very capable business woman but as a dear friend.
Franks had worked for Lucy for only two years before sailing with her on Titanic. She remained in Lucy's employ until around 1920, having by that time become her social secretary, the job of business secretary falling to another of the staff, Ruby Sutton.