Hello everyone. I want to switch to mixed feeding. But my baby doesn't…

Hello everyone. I want to switch to mixed feeding. But my baby doesn't take the bottle with formula. I already changed two bottles. And she doesn't drink water from the bottle, only from a cup. BUT. I pumped my milk into this bottle and it happily ate it. I don't understand, maybe it just happened once, I was going to the dentist, decided to pump as much as possible, it turned out 60ml, my sister said that she took a break just to breathe ? who had this experience? Did your babies end up taking the bottle with formula? And how long did it take?