With my different roadsters it took about 2 to 3 weeks until the battery became weak. Therefore also with the 2014 4/4 I had installed a battery main switch as a precaution. But as other 4/4 Sigma drivers can probably confirm, there is no problem even after two months not driving the batterie is strong since six years. Maybe she has a different Immobilizer system than the Plus 4 ?
