Kindness is the beginning of cruelty.

If Gia is messed up on dope then what she needs is for someone to slap the shit out of her and then tie her face down for a week and every time she tries to make some bullshit excuse for her actions she'll receive a paddling on the ass. Once the physical withdrawal is over then you start working on mentally reconditioning her through the scrubbing of toilets and anal sex.