Since it appears you're going in the next month, I'd wait to change her to cow's milk and take her off the bottle till after you get home.
We started weaning my son from the bottle at about 10 months (giving forumal in a sippy instead) as I didn't want to have to drag bottles with us. At 12 months (oct 2008), we weaned him off formula and onto cow's milk (2% in fact and he's doing just fine still). By the time we went in Dec 2008 (he was nearly 15 months old) he was off formula and bottles.
If you had more time before your trip and she wasn't turning one while there, that's what I'd suggest. But for now, wait till you get home from the trip.