Was she drinking heavily at the time? Maybe she spilled a gin and tonic inside the monitor.
Seriously, if it spins up and you can hear the hard drive turning, but can't get anything on screen, I'd check the obvious stuff first...make sure the monitor is plugged in to both the computer and a power source. If you have a spare monitor, try hooking that up. That sort of thing.
If the hard drive is spinning and it doesn't just hang, but sounds like it is going through the entire boot up process, could be your video board or chip got fried. If the hard drive doesn't spin or it does for a short while but hangs, may be the mother board, memory got fried, CPU got fried, etc. If you pop the cover off and something did get scorched, you might get a visual cue. Otherwise, you may have to take it to a shpo for diagnosis.