K.D.
My twin daughters are fully breastfed in that they take breastmilk all the time. THey are almost 6 months. My ped. was very insistent ( she is breastfeeding friendly) that I try a bottle around 1 month she said that she has seen too many people wait and then it won't happen ( not easily). She also said that I had to consistently give them a bottle. She suggested at least once a day in order for them to take the bottle when I can't be there. She said others make the mistake of introducing a bottle, the baby takes it and then they don't give them another bottle for while when they try again the baby won't take it. I am thinking that if you stop trying then she might not take or it will just get harder. I have heard that babies also wait for what they prefer. One of my twins prefers the bottle and waits for the evening bottle and eats a lot then. The other one definately prefers the breast and she will only take a small amount from the bottle and wait until the next feeding.
I hope she can get it. I know it is really tough to not have that flexibility. I did babysit for a friend who exclusively breastfeed and then left me with a bottle of formula. Her son (3 months) drank and ounce and eventually cried himself to sleep hungry. She just fed him when she got back. He never did take a bottle just a sippy at 6 months.