OK - My W is not organized either and we even have a joint calendar with all the kids activities on it. She will even call me to pseudo get permission to miss certain things. It is what it is, I believe it is due to her focus not being on S3 right now and her attention is other places (probably placed on the OM and her new life). My EW does the same thing.
She makes things difficult I believe as a way to remove some of the guilt from her conscience by making you out to be the bad guy. That is why it is important to hold the line.
My EW used to text like that early on.....eventually she stopped when I didn't respond. She will get the message over time.