Snakes are pretty good about getting injections. I've had to give some too, not my favorite thing but not because of any lack of cooperation from snakes.
FYI, when snakes have injuries, they tend to shed a bit more frequently as a means to repair. The injured/stitched area will be a challenge as far as stuck shed,
but if you're still doing the "wash & cream" stuff it will help loosen whatever remains anyway. Don't look for a perfect shed for a long time...
BTW, I think that was great advice given earlier, about feeding smaller prey items (when she's due to feed) to keep from stretching the injured skin.