I think a good barometer is if one or the other is calling each other names, you end the conversation and start again.
Time with Caleigh isn't a bartering tool. If you offer to give your ex spouse your daughter a day early, you give up that day. The same goes with Kim. Did she ask you for a make up day because of the surgery? If one or the parent offers to tack on an extra day, that's all well and good. It's your choice. You have options. You choose your priorities.
This early on after the divorce might not be the best time to start switching up things. Only you know.
*hugs*
PS... has anyone ever mentioned that the Tide sounds like laundry detergent?