Sashka, I think we'll just have to agree to disagree about the possibility of Aubart having been prosperous from a singing career that no one's discovered any record of.
I agree with everything you said about the importance of staving off foregone conclusions in academic research, but academic research is something very different from kicking ideas around on a message board. If I were preparing a book and presenting a version of Madame Aubart's life and character for the world, I wouldn't allow myself as much latitude for speculation as I do here.
If Ninette Aubart was a woman with choices (which, unfortunately, means money more than anything), than her association with Guggenheim is all the more interesting to me. Some of the passengers who intrigue me the most are the women who managed to do something different - either personally or professionally - than following the course mapped out for them. I'm referring to Alice Leader with her medical career, Elsie Bowerman with her legal career, Edith Pears with her ambulance driving, Daisy Minahan and Marie Young with their teaching, Harriet Crosby raising a child born out of wedlock, or Mabel Fortune leaving her marriage to make a life with a woman.
I don't feel I'm doing Ninette Aubart an injustice to say - whatever their personal feelings for each other - it looks like Ben Guggenheim did provide some financial support. There's the fact that stories survived within the Guggenheim family that Aubart accepted money from them after Ben died.
There's the fact that Aubart and Guggenheim were heading to the city in which his wife and children lived, thus the place where it would have been the most impossible for them to have a real life together. True, there are many possible reasons for this - he wanted the woman he loved to see his home, he wanted to be near his children and she was consenting to degrade herself by leaving her social life and home and spending her life sneaking around and doing it out of her love for him, she had a job opportunity and so he was going with her, they were just going for a short visit because she wanted to see New York and he had things to attend to and.
The biggest reason is that this is 1912. Did most women who severed ties with respectability (and remember everything that that entailed) do so because they wanted to? What are the odds that Aubart was financially independent? Sure, she might have been an heiress or a pioneering entrepreneur, and a serious researcher should examine those possibilities. But how likely is it? A small minority of women in 1912 lived unconventional lives, and only a small minority of those did so because they chose to.
There were other women on board who had non-traditional romantic lives and who I don't assume were "kept", either because there is no evidence to suggest they were or there is very definite evidence to the contrary. But in Ninette's case, there are indicators - not proof positive - that she was.