Pooping shouldn't make a difference in feeding schedule. If you fed her the 9th, then the 14th would be an appropriate date. Then the 19th, 24th, 29th, etc. It doesn't have to be perfect. If you feed a day early or a day late, this doesn't really prove to be problematic as long as you're in the ballpark. Just like some people will tell you not to feed while they are in shed. A lot won't eat in shed, but we have a couple that will and if they are willing, we have not had a single problem. Fed one in shed last night, actually. Her rat barely hit the floor of her tub and it was gone. In time you'll learn how to read your snake and you'll find your own methods that work best for you. Follow them. Our advice should be taken as a guideline and is in no way set in stone.
A little tip about weighing. Always weigh them when they are completely empty so you get an accurate weight. We weigh on feeding day before feeding, after a good poop. Because of their slow metabolisms they will have usually have little bits of food or poop left in them, so you're not only weighing them, but their food/poop as well. That can create a 10-15% variance in your snake's actual weight depending on how soon after eating you weigh them.