Nursing offers wonderful benefits, but if the mother is detoxing, her milk may deliver toxins to her baby. Rather than flushing, consider improving your diet and be ready to flush when you wean your daughter? If you already "eat clean", flushing is not urgent. Meanwhile, tank up on mercury free Omega-3 fatty acids -- they help brain development.
I stopped nursing around 18 months, mainly due to the demands from work. I pumped for 7 months and nursed morning and evening for the rest. When I traveled, my baby traveled. It was so nice!
I am delighted that you are still nursing -- it does both of you good.