When a landlord does a walkthrough, they have to give 24 hours notice before they can enter the property, as you also have to be there. Why not have your gf lay in the bed and act sick? Tell him your keeping the door closed and the light off in the room due to her illness.....Say Phenomena or herpes something that he could catch lol. Anyways all the landlord usually does is just walk around looking to make sure your keeping the place in decent shape. The inspection usually consists of the landlord sticking there head in every room real quick to make sure there are no major damages or stains. Other than that, honestly if the light is out in your tent, and in the room, it will be hard to tell if someone is actually "in the bed sick or not"
If the place stinks light some candles and say sorry about the smell when he walks in, say your gf has been sick all night and the smell is horrible! Just keep apologizing and ask to make sure he keeps it down since she just got to sleep finally.
People are for the most part respectful, so it will work.....No one is such a dick to wake up someones sick gf just to get a full visual of the room. He will write it off, just insure him nothing is wrong with the room or maybe the window leaks something small and stupid he can just write down and move on.