It would be good to continue experimenting with various methods (different bottles, cups, etc) over the next couple weeks. Babies often do a little better when it is freshly pumped milk (which can remain good at room temp for several hours) and when it is offered by someone other than you, you should be no where around. Also try before the baby is too hungry and already crying a lot, offer when you anticipate the next feeding and every so often thereafter. If she takes a pacifier, try getting her to suck on that and then swiftly switching it out with a bottle. I bet once she has more practice she will take to it. I would try for one feeding a day until you leave. She will not starve herself for two days, she will find a way to get food eventually. If she is not good with a bottle/cup by the time you leave, I imagine it will be a stress filled time for the both of you. But you will all make it thru in the end.
Whatever you do please do not stop nursing. Even if you only stop nursing and pump instead to prepare for this trip you will be needlessly compromising your milk supply. And she may not go back to the breast if you quit directly nursing cold turkey and force her into taking a bottle full time.
I hope you find a solution before you leave and can have a more peaceful time away.