Michelle should do what ever makes her happy (And richer maybe) and not worry in the slightest about what other people think. It is her life and those that don't like any adult type career move she accepts don't have to look.
I agree that if she gets deeply involved with the glamour world that it would be the end of a romance between them.
Even if she doesn't Stuart it seems has had a more straight laced upbringing and I don't think his mind set would be mature enough to live with a girl that loves the freedom of inhibition of life as much as Michelle does
What ever you decide girl. Just be happy.......