I don't know if you are following slgs or TR???
That said 67 on a pet meter would typically just earn her a reduction even on TR, however, it is only 4 cycles since you reduced the dose, and the depot can be in play for up to 6 cycles, at 4 cycles it's borderline whether the depot of 1u may be influencing today's cycle....so it's a tricky choice.
If you are able to monitor closely over the next couple of days you could hold the dose and see if she really wants the reducie, you will need to be prepared to steer her with higher carb food.
Another option, if you are not able to monitor closely to keep her safe over the next couple of days, would be to take the reduction but watch for numbers trending up and be ready to call a failed reduction and bring her back up to 0.50u should her numbers warrant it.
Additionally if she were to bounce by pmps, and be in high yellow or pink you could shoot through the bounce, holding the dose and taking the reduction tomorrow morning.
The above options are only applicable to TR, if you are following slgs, then take the reduction to 0.25, seeing as that 67 is way below the recommended reduction point of 90 for slgs.