Hi. I'm Dr. Lee and will do my best to help.
Was the hernia a reducible or non-reducible hernia?
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If you can please give me more information as requested above, so I can better understand the problem and help. Thanks.
Umbilical hernia itself is not uncommon. There are 2 types of hernia, either reducible (meaning it can be push back inside the belly), or non-reducible (cannot push back inside). Usually when it is soft, they are usually just fat from the abdomen. When it becomes firm, it can be a problem as it is now stuck. It is not necessarily life threatening depending on if it is reducible or non-reducible. It is best to have that fixed. Now that it has been 2 months after she had the puppies, she can also be spayed at the same time if needed. If you want to keep her intact, she should still have the hernia repaired before it gets worse, meaning getting bigger and in case if there are intestine that can loop into it and get stuck, causing necrosis (death) of the intestine.
Please let me know if you have any questions or concerns. Thanks.