Be sure the headlights are switched to 'off'...even though they shut off when the car is turned off there is still some drain if the switch is in the 'on' position.
The "auto entry" mentioned above is better known as the SKS or smart key system and, indeed, really does need to be turned off with the button under the steering wheel.
Finally, if she'll let you, why not make the Prius 'your' car for the next 8 weeks. It'll keep that 12v charged up, will save gas, and give you a fine opportunity to appreciate the Prius (I'm assuming your car isn't a Prius)?
But, if you will be around the car just take care to drive it around for 15-20 minutes once every week or two to allow the 12v to charge up and to keep the SOC of the HV battery at a comfortable level.