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A spayed dog should not be having a greenish discharge at all. It is likely to be a vaginal infection called vaginitis. You can read about vaginitis here:
Since she is also having some incontinence as well, I'd have the vet check for a urinary tract infection since that is a likely cause. Read about UTI's here;
It isn't unusual for a spayed dog to develop a UTI especially if the vulva is recessed leading to more bacteria in the area. I'd try and get her seen as soon as possible so she can start treatment which is probably going to be antibiotics.
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