Often times, I typically go to YouTube and type in "LAPTOP_NAME_HERE gaming". People have a knack to record the performance of said devices, so it shouldn't be hard to find the game that your laptop can play.
Hmm. If you have a external USB or HDD, back the important things up just to be certain.
Did you check what her power settings were? Max brightness? Performance Battery Mode?
You sure she isn't keeping the batteries plugged in 24/7, which is killing the cells in the battery and rendering them unchargable? Or does she happen to have a third party charger? Universal charger of some sort, or one not manufactured by Dell?
That charger probably did mess your laptop up. That's why its not recommended to buy a charger outside of the one provided by the manufacturer of the device.
RMA is returning a broken / defective item for replacement. Since you're out of warranty, you'll probably have to pay a fee. Shouldn't be the full original price though.
It should work with any ISO copy of Windows.
If you happen to receive an "Invalid ISO" error, follow these steps:
Download PowerISO.
Open the ISO.
Under Properties, uncheck Joliet & ISO 9660. Then check UDF.
Save file as. Then it should work.