I agree with
. I can't see a problem. It could be natural variation in the child's development, it could be the genetic height/weight becoming more prominent (as in, she is more "average" than she appeared to be before age 2)... it could be that particular month or time of year that she was measured both times.
Did it occur to the Dr that it might be pre-growth spurt when chidden may take on extra weight - it would also explain her apparently shorter height... then when kids have their spurts, they suddenly seem to actually lose weight. It is the growth spurt talking.
I also don't find these charts and measures reliable in any way that would dictate a change in diet or nutrition. If you are already feeding her a healthy diet, and she is getting enough hydration and is active and has energy and is not feeling hungry.... I think everything is fine.
If there are some of the issues above, then it likely has nothing to do with weaning from nursing. I didn't find a change at all over time when the amount of milk reduced during nursing times (over 5 years). The only change at the outset is the first 6 months at times, when babies are mistakenly compared to all babies's charts, where they compare formula-fed babies' weight and percentiles.
Why let the Dr worry you? Is this Dr an expert in dietary development in young children? If, not, I would put zero weight (pun not intended) on the chart that the Dr is relying on.
Let your child be healthy as she is....