Hopefully she will wait until you get home to drop that calf.

Even if she doesn't, she will not forget you in a week.
Cattle have good memory (especially when it comes to which side their bread is buttered on!).
Give your DH a run-through on what you have been doing with her.
Get him as comfortable as you can in working with her before you go.
Do you have a vet for him to call if the calving goes too slow?
Chances are that everything will be fine while you are gone.
In case it doesn't, just try to have a back-up plan.
Oh, and I would go ahead and shut her in the stanchion.
She will quickly realize it wont kill her.

Do it before you leave, and get your DH into the habit of it.
It could really help him (or the vet) if they need to immobilize her while you are gone.
Chances are she will very briefly fight the headlock, then remember that there is FOOD.
Better for her to have this realization now, IMO.
Good luck and here is hoping for an uneventful time.