Remove battery and power supply - press and hold power button for 30 seconds.
Try with only power supply plugged in.
If still nothing the there is nothing to lose by opening it up. There may be a small round battery visible, try changing this.
I suspect a broken solder joint somewhere, unlikely you will spot it.
Your daughters data is still on the hard drive and a usb/sata adapter can bought cheaply enough. This would enable the data to be retrieved and copied to a new laptop. The old hard drive could then be formatted and used as a back up drive.