Startup disk only shows: Mac OS X Base System
/dev/disk0 (the USB installer disk) is the only physical disk visible here. The rest are all virtual disks of one sort or another -- /dev/disk1 ("Mac OS Base System") is a disk image mounted from the USB disk, and the rest are RAM disks used by the Recovery system.

Since I don't see any sign of your internal drive, even at the /dev entry level, I'm pretty sure you have a hardware problem that nothing like DiskWarrior will be able to help with. The disk itself may be dead, or a cable torn, or a connector knocked loose. In any of these cases, the only chance you have to get data off is will involve opening up the computer, checking cables and connections, and maybe removing the HD. Recent Apple laptops are not very easy to work on, so you may not want to risk doing this yourself. If you want to try, there are guides at iFixit.com; if not, find a repair shop to do it for you.

If it's just a cable/connector problem, repairing it and getting your data back is pretty straightforward. If the drive itself is dead, you may have to send it to someone like DriveSavers for recovery (which is expensive).