Well it's normal for all the boys growing up that I knew when I was a teenager in Ireland, @Sway19, and all the ones I know of now through DS. What else are they supposed to do when they can't meet up with each other, go to school/college, or work? They stay up til the middle of the night gaming and then either lie in bed all day or get up to do something and then have naps in the evening and of course the vicious cycle continues.
My brother used to stay in bed as late as 6-8 p.m. in the summer holidays from as young as 12, so I've never been worried about DS doing it.
Also, it is normal to be angry and depressed at the situation we are in, especially if you live alone. In fact, if you're not angry and depressed at the situation we're in, that's abnormal, IMO. Obviously, you keep offering to do what you can, OP, but it sounds as if she is too worried to be around family at the moment, bless her.
All you can do is carry on letting her know you're there and trying different suggestions for anything that you think she might enjoy and temporarily lift her spirits.