End of supplementing?

Baby wasn't gaining enough weight so doctor had me breast feeding for 15 min on each side then 2oz bottle of formula. At her last appointment she had gained enough but still seemed hungry so I was advised to stick to the plan but use 4oz bottles. She never drank more than 2oz. I started pumping to establish a better supply and started using breast milk in the post feeding bottles I gave. My breasts now become engirfed and I can hear her suck and swallow. After a feeding (which I stopped timing a while ago) my breast are soft and less heavy. Anyway my concern is she will no longer take a bottle at all. Maybe my supply has returned and I no longer need to supplement, or maybe she's stubborn and left hungry???