Two differing answers:
1: Sustenance is key to any build, your blood sugars drop, you lose concentration and the next thing you know you've got an upside down PSU, cables poking out of fans and a a cardboard box in a 3.5 drive bay.
So, the most important job for her is, making you a drink and food as and when required.
2: OK, seriously, just ask her what she would like to do, then do it and have fun together building it.