Yeah, don't get worried. I'm just letting you know that a GREAT rule of thumb is: "Everything in moderation". Even if you overdo the "good stuff" you can get injured.
Stretching is natural and is good for a virtually any dog. However,again in your case you really want to limit that as much as you can until her suture site has accumulated some scabbing and the redness has subsided. Let it get well on it's way to healing so the body can better protect itself for infection and then let her go back to her normal self. For me usually three or four days are all my "kids" need before their suture sites look good enough that I feel they can play around. I still wouldn't let them jump on the sofa and such or race up the stairs, but otherwise everything else is okay. And I'd just check the site a few times daily to make sure everything still looks like it's holding and she has less and less sensitivity to the site.