(((hugs)))
I'd just wake her for her bottle and if it were me, I'd probably just cuddle with her for the rest of the night -- maybe bring her into your bed for a bit -- if the bottle wakes her up some, she might need some time before she goes back to sleep so she very well might sleep through that normal 6:30 bottle -- and then with all the distraction about getting to the appt, she might not notice all that much! It will probably throw off your schedule for a few days, but if you stay consistent and listen to her cues I'm sure that it will all get back into place. And if not, there's always the Getting Back on Track board.
Hope everything turns out ok!