Clue: a huge percentage of sex workers enter the sex industry because of the FREEDOM inherent to it. Okay? This is really easily learned by doing some research. Huge flexibility in terms of working environment, huge remunerative possibilities, no bosses, no contracts, you don't ever have to formally resign, you can't be fired (every brothel I've ever worked in that's "fired" a girl has welcomed her back a week later), you set your own hours... sex work is HUGELY appealing to lots of people (men and trans people too believe it or not!) for all of these factors, all of which are tied to freedom and independence.
I can't even describe how comforting it is to me to know that, no matter what happens, I always have sex work to fall back on. It's always there and there's always money in it. It's a GOOD feeling.
You are speaking from ignorance and misguided preconception and it is offensive to both Selina and sex workers to characterise this way. Frankly, prostitution is one of the most perfect career choices for Selina. Stop being so whorephobic.