Let her groom. She will probably clean it and then leave it. Really, it's been a week. If it's still red it's probably from having a bandage on. None of mine had redness after the first few days. Like I said, they licked a little but not excessively. She probably is because she is irritated from the bandage. JMO
Just a thought. Does your vet charge for an office visit when you go back in to get the bandage off? He shouldn't be. The price should be included. Ask your vet if he used dissovable stitches. I have never even had to take any of mine back for a repeat visit after a spay.