The split personality that you are talking about might be due to her gold digging habit/experience, she had done it so many times that she has become over confident in her skill. Now as I have said what she did is definitely dumb, but what if that's who she actually is, a dumb slut, who had it easy so far and this is where she will be snapped. And this might just be how she is written for the game like dev has already stated
here.
Kathleen kinda decodes her perfectly in her exhibition, says she's just a gold digging slut, she left her poor mom (who taught her painting from which she earned a national award/medal, but she said she couldn't have made a Life out of painting after admitting that she loved painting, again kinda foolish) to dig gold in the city and probably might have already mined many gold mines before strucking the absolute peak gold mine (Elias) but Kathleen mentions that for a gold digger like her nothing is peak, she can't ever stop chasing gold, now definitely Kathleen was cut by Felicia admitting that and saying "you gotta eat until you bust" and I think this club will be the last thing she will be eating and before even consuming it she will bust (in a wosrs kinda way), how?.
Now take this with a grain of salt because this is just a bad theory but I think Kathleen herself will expose her to her husband because I don't know why but after playing the 2nd exhibition I am getting a feeling that Kathleen isn't gonna let the carnations go anywhere (might be just me or the game deliberately want you to feel that way) , seems like she will do everything that she can do to prevent the carnations from going even after the exhibitions has ended. Basically it seems like she is putting the carnations into a point of no return (it's subtle but it's there) and what better way to do so in case of Felicia than to shatter her marriage?
Btw anyone noticed nobody talks about the former carnations, what happened to them? It might be because it's totally irrelevant/"not connected" to the current plot or it might be that information has been withheld deliberately to make up for a shock at the end.
TD1900 will this arrangement of choosing a single carnation continue till the last exhibition or will we have to face disappointment by unavoidable humiliation of all of the carnations, I have selected Felicia to enjoy the punishments so far, the other two carnations are off limit to the patrons in my playthrough and I would like for this to continue till the very end or do you have some other plans?