Did you try to mix breastmilk and formula to let her get used to it? What I did when I want to wean off bm and switched to formula is that I started with 80(bm)-20(formula), then slowly increase formula to 50-50, then subsequently transit to full formula. And according to the nan representative, she said some babies will need at least 8-15 tries before accepting formula.
naddyzzzz -