Thanks for all your replies. Last night I thought I had it figured out. At 4:30 a.m. she only ate from one breast and seemed satisfied, so I put her back to sleep no problem. Didn't follow with the other breast or bottle, like I normally would have - and also no vomiting. Yippie. However, she then woke up at 6 a.m. she woke back up (she's usually on 3-hr easy, like clockwork). Tried to soothe her with paci and pat/sh, which worked for about 10 minutes at a time, then finally at 6:30 a.m. I fed her the other boob and 50 ml from bottle. Seemed ok. But, what I'm worried about is losing her good schedule.
Perhaps what I will do is pump and feed her bm from bottle, at least then I know how much she is getting, though I'll miss the bfing...