D.U.
My daughter was the same and as long as I kept feeding her after like, 7 hrs, she would refuse the bottle. I would pump my milk and give it to her in a bottle, which she began to like, but I had to completely stop breastfeeding in order for her to accept the bottle. 3 days of not Bfeeding her, but only giving the bottle persistently did the trick and she got used to the bottle. I pumped as long as I had the patience, then stopped. Actually, it will be more difficult the older she gets. This small, she will give in.