Dear X - many dogs eat ferret poop with no ill effects - I own one.  She
likes that crunchy snack food we put in the corners!
 
There is really nothing bad in ferret poop, and little that is
transmissible (perhaps Giardia, but that's pretty rare.)  Dogs seem to
tolerate it much better than their owners.  I can't think of anything
that would make her vomit immediately - this is not the typical response.
But it's probably a good thing and she will eventually get the idea that
poop is not for eating.
 
If the vomiting is simply a product of eating the poop, and not seen
outside of this activity, I don't think a special vet visit is needed.
However, let's make sure to keep those vaccination/worming/and checkup
visits.
 
With kindest regards,
Bruce Williams, DVM
[Posted in FML issue 3457]