Is a red raised spot with dark center normal on my spayed puppy?

It looks like a bit of suture reaction - this is very common and goes away on it's own. As long as there isn't anything coming out (like pus) from the area and it's not bothering her, just leave it alone and keep an eye on it. If she's lethargic, has poor appetite, is trying to lick it, or has any discharge, she should go back to the vet to see if she needs antibiotics or other testing. But 9 times out of 10 (probably even better than that) these need no treatment - it's just the body dealing with having something inside that shouldn't be there. The sutures will dissolve over the next month or so and the reaction will go away. I hope that helps and good luck!