It's hard to tell exactly when Kierra's nadir is lately, as I don't see much in the way of tests other than +6 mid cycle. Any time you get a lower number at +6, you might want to test an hour or two later to make sure that was the lowest point. Besides which, nadirs can and do move around a bit. You might want to do a partial curve or mix up those +6 tests a bit if you can.
According to the spreadsheet comments, it does look like Kierra is gaining some weight. What is her ideal weight?
As for feeding after nadir, it can shorten duration and give you higher preshots. The insulin is strongest before nadir, after which point it's BG lower ability starts to slow down. If you feed carbs after nadir, that slows the insulin down even more. If you have to feed after nadir (whenever that is), you can try giving as low a carb food as possible, though one with higher calories if you need her to gain weight.