I'm not a vet so let me be clear about that. However, the wound looks open, but not serious, and it doesn't look infected from the pictures, at least to me. My basic advice, therefore, is to not panic about it.
If you still have the cone or the body sock that they gave you when you got the operation done then put it back on the dog until Friday when you see the vet. You can try keeping the wound clean until then by dipping a clean/sterile gauze pad in some hydrogen peroxide and dabbing it on the wound. Depending on how irrtated the wound is it might sting a bit so be prepared for the dog to not like that. I would NOT put any topical creams or soaps or anything else on it for now. You can try using medical tape and a gauze pad over the wound to keep the dog from licking it for the next few days but there's a good chance if the dog can get at it that she'll just rip it off again. It's worth a try though. If she does tolerate having it there then you'll need to replace and clean the dressing every day. When you are cleaning the wound dab the disinfectant on it because it will be irritated and possiblly painful for the dog if you pour it on or rub it. Finally, whatever you do, do not try to remove the stitches yourself. Leave that part to the vet. They've seen this all before and they will know what to do.
As for the vet, there's a good chance that the vet will need to touch up the wound and your dog may need to be in a cone for another week or so after that. I'm sure the vet will advise you in detail about that. The main thing to remember for right now is to try to keep the dog from licking it and to stay calm. If it were my dog I would view this as a minor setback. If it changes or starts oozing between now and Friday then you might want to take another picture and send it to the vet for a "telephone consultation" and additional tips. I wouldn't do that if it stays the same if it were my dog but I would if it looks like it is worsening.
Hope that helps.
