Breastfeeding to bottle feeding cold turkey?

I’m a exclusive pumper and my milk supply dropped but we were trying to switch baby over to formula slowly I currently have no stored milk since I’m not producing enough. the milk I pump gets fed right to baby. The little bit I have in fridge is to top off bottles since she just got bumped up to 5oz. But anyway I have to take a last minute trip and can’t bring the baby it’s only 1 day but I have no stored milk to leave with the sitter so she’s going to have to drink formula. I’ve been only feeding her 2 formula bottles a day and she’s taking it well but is it okay for her to be drinking only formula that whole time I’m gone not being weaned into it?