Are you kidding? I know all about how glamorous the life of a lady of the evening can be, I've seen Pretty Woman!
I'll stand by my opinion that Selina is independent in a solitary sort of way. Dare I say aloof and a little bit elitist? She doesn't have any very close friends, doesn't belong to any groups, and lives alone with her cats. This is why I think that she's not very well suited to being an automobile sales representative, at the risk of drawing the ire of any hawkers who might be reading this. This is not to say that car salespeople are good or bad, it's just that I don't think of Selina as a "people person", that she would be more likely to settle for, say for example, driving a semi-tractor trailer by night.