I’m not in favour of early release schemes like this tbh. If the right sentence for the crime is 16 weeks, then sentence her to that and make her serve it. If the right sentence is 2 years, then sentence her to that and make her serve it. Such large reductions make a mockery of the sentencing guidelines and really are only in place because of an inability to provide sufficient prison places. If some kind of reduction is needed for those with long sentences so as to encourage good behavior, then give just enough to serve as motivation for good behavior, no more. If a prison sentence is meant to be both punishment and deterrent, then I think this case serves not as a deterrent but an advertisement for drug gangs looking for willing mules. Whether 16 weeks is sufficient punishment will depend on your point of view and I imagine there is quite a wide disparity of opinion on that.