At one week, it's unusual that there is a constipation issue since the chick couldn't have been eating for more than a couple days. But if there was pasting over of the vent, that could have clogged her. Simple cleaning of the vent should have been enough to clear her, and an 'enema' should never be necessary with any chicken as their plumbing isn't like a human's.
When constipation in a young chick is suspected, the best practice is to give the chick coconut oil orally so as to soften any impacted stool to then be able to more easily expel it.
When constipation in a young chick is suspected, the best practice is to give the chick coconut oil orally so as to soften any impacted stool to then be able to more easily expel it.