There is still the idea of installing a main "kill switch" which will not allow current to get lost.
In Laura's case, if the battery is dead, not useful. Also cause she is selling the car soon probably.
I have known a guy with an old bmw who just had a small spanner and disconnected / connected the battery every time he wasn't using the car for several days.
Bad for radio presets. But it's a choice over jumpstarting and draining the battery many times.