Co-parenting is making sure that what needs to be done gets done. If she needs your help and you're not otherwise obligated then do it! We should never use parenting as a means to make the other person feel the divorce. If she becomes overly demanding or if asking becomes a regular occurrence with no return then it's time for a talk, otherwise help each other out. She has said that she'll meet you there and take over from there, that's her trying to hold up as much of her end as she can. You can ask her to help you out to. Voldemart asks me to help her out at certain times e.g. swamped at work but she also covers for me when I need her to. It doesn't matter whether it's her week or yours. What matters is that your child's medical needs get attended to.