Just **** up her PC when she is out of the house. I managed to get water on my motherboard whilst computer was turned on recently (don't ask) and it borked it goooood 
Only needed a replacement mobo but the whole thing was dead until I bothered to replace.
Just steal the RAM, when she turns it on it will beep and she will pap herself and ask you whats wrong. Take a look at it and give her some BS.

Only needed a replacement mobo but the whole thing was dead until I bothered to replace.
Just steal the RAM, when she turns it on it will beep and she will pap herself and ask you whats wrong. Take a look at it and give her some BS.