Re: to supplement or not?
I would not start formula at that age personally. I would continue to offer the breast and make sure she's getting plenty of solids. Keep pumping to keep your supply up. Try offering the breast when she is sleepy. Or try taking a warm bath together and offer during the bath. That always got my babies interested.
“We are not put on earth for ourselves, but are placed here for each other. If you are there always for others, then in time of need, someone will be there for you.”