C.P.
If she'll take a sippy cup over a bottle, there's nothing wrong with that at all - most important thing is she's somehow getting your milk or formula in some manner.
Dr. Borwn's has the wide bottles with nipples that are shaped to be more like a mom's breast. Have you tried these? Maybe if you make one and hold it close to your chest area to feed her, she'll take it. Doesn't hurt to try, you still have a little time before your trip. Good luck!
-Char