Can you hear if the hard drive is spinning/doing anything?
Was it acting normal before this happened - or has it been acting 'buggy"

I'm not a Mac user but a computer is a computer more or less..

I'm thinking she might have got a virus or something inside went bad- hard drive maybe if that is making no or odd sounds??

I found this-
[Troubleshooting a MacBook or MacBook Pro that won't turn on
Symptoms

There are some simple troubleshooting steps you should try if your MacBook or MacBook Pro won't turn on. Use these steps if:

Your Apple notebook's display has no picture after you turn it on.

You don't hear any fan or hard disk activity sounds after you turn the computer on, and the sleep light doesn't turn on.

The computer doesn't seem to have any power when you try to turn it on.
]
http://support.apple.com/kb/TS1365?viewlocale=en_US