Primary note: it is your game, play it how you want.What should I do with Michelle after finishing her quest? She has decent Academic and Science, but I'm not sure what they're good at.
With that said...
What traits did she get?
Do you plan to run a prostitution ring? She's young and pretty so corrupt her (and train her oral and vaginal) and you've got a good goldwalker.
Want to keep her for yourself? (I do.) Maids are always useful. Or assign her to a Workaholic Trainer and she can be a workshop worker.