One week to be divorced... and counting

[Ripe]

XW arrived yesterday from the mainland after having signed the divorce papers.
Today I took the kids to her place. Dropped them off at her door, waited for the door to open and took of.
Did not see XW, as usual.
Three minutes later my phone rang. I thought it was one of the kids wanting to talk to me, maybe something he forgot something in the car or at my place.
It was XW.
Said good morning. Then she told me S10 was having a tantrum because the mother dyed her hair and was telling her he wanted to come to my place or use a blindfold for the rest of the week.
She wanted me to have a conversation with S10.
I said yes and talked to S10. Said it was his mother's choice and that he had to respect that. Added gustibus et coloribus non disputandum and that by the end of the day he would be used. He did not need to approve but had to respect.
Only after hanging the phone I realized: what the hell has that to do with me? Why is she asking me to intervene in a situation she created?
I know it has something to do with S10 behaviour, but I am not WX husband any more and I'm not there any more because she chose so.