Theoretically, yes, and it's been added now, but unfortunately it takes some time for the changes we make in the Incubator to be active for users (sometimes as long as two weeks).
Still, please report (with the button in the lesson, not in the discussion) if it's not accepted, it's still possible something got missed!
I honestly don't know how you guys will be able to keep up with all the context-possible variations.
Time and user reports. With experience we get pretty good at remembering what we need to add, and when we remember something new we check the similar sentences to make sure it gets added to them too. And as time goes on, users report more and more of the possibilities we missed, and we add them. But it does take a lot of time and the prpcess never ends, no course is perfect!
Does the prepositional phrase "in urbe" have to come before the verb, or could you acceptably say "Soror student in urbe"?
You could. The verb is most commonly placed at the end, but you can move it around, with a shift in emphasis. In this sentence you can pretty much do what you want (with change in emphasis) as long as you keep "in urbe" together.
Said nobody in ancient Rome, ever... Or maybe that is just my prejudiced mind. I've always been a huge fan of Duolingo's quirkier sentences, and I hope we will get some sentient animals later. In the meantime, I'll enjoy the gender-neutral society depicted here! :D