A.A.
First of all, if it's going to complicate your life too much and is too stressful, it might be time to switch your daughter to formula, if you think it's the right decision for your family. It sounds like it's something you would like to do. Just so you know, it's ok!
I would give her the milk in her cups first and see how she reacts. If she is really upset by it then I would try the bottle. I would start this process ASAP even if it's just for one feed per day so that she's not having milk from a cup/bottle for the first time when you are not available.