
It is very unlikely to cause her any probl;ems at all.
This article may explain things better.
http://www.showdogsupersite.com/kenlclub/breedvet/umbilical.htmlThis passage would be most relevant:
.....If the dog is a year old, has a small bubble, or 'belly button', and it cannot be reduced, has been there since it was a baby, and the dog is healthy and well, it is pretty obvious that the bubble does not contain any intestine. While the puppy is younger, it may not be clear. The very tiny holes with a small bubble of omentum do not require surgery. Slightly larger holes should be closed to be sure that no intestine becomes strangulated in the process of closure. NOTE: no delayed closure can ever close completely simply because there is something sticking through it. If there were no omentum sliding out, they would continue to close normally. What they do, is they close tightly around the omentum, trapping it outside in an absolutely firm unchanging bubble........