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Hello, I think perhaps we were speaking about your dog that just got spayed? Is this the same owner?
OK!!! It does look like her incision could be becoming infected based on your photo. It could be infected or she could be having an adverse reaction to the sutures material that are in the body.
I do think she needs to get checked out by her vet, but it can probably wait until tomorrow if she is otherwise normal. I would, however, recommend picking up an e-collar in the meantime to prevent her from licking (sometimes they do even when you are not looking!!!), most pet stores will carry these, and also your vet has them. If you cannot get one, you can also try putting a baby onesie over her to prevent her from being able to get to it.