Re: "do you live by yourself?" appropriate to ask
If you're trying to pull that information out of her then it's best to go about in an unsuspecting way. You need to add that question in with a few others.
"So are you going to school right now, or are you just bumming around like the rest of(insert group or age group of people here)."
Depending on her response.. "So you live on campus/at home still?"
Good luck. It's simple enough.
"You know what my dream for this summer is? To have all the girls that you and I have farked this summer out on the SS Vagina."
"That is the dream. It'll be one big mess of bad decisions and failed relationships."
"We're the guys you don't introduce your parents to."