I am on mat leave, and had emailed her to sort out a keeping in touch day we'd agreed I'd do. I work in a very niche field and this particular small piece of work is even more niche. I am happy to do it and had agreed I would do a half day KIT day 4 times in the year I'm on leave, to do this. She agreed this, her manager agreed it, and we let clients know that's what would be happening. Only for her to email me today to say a (much more junior) colleague can do it fine, and she hopes I learn to enjoy my children while I'm off. WTF? Offering to work a half day, which we'd agreed I'd do, means I don't know how to enjoy my children? AIBU to be seriously pissed off? Not to mention a letter has gone out to clients saying I'd be doing it, and now someone they don't know is going to. I don't know how to start a reply, and probably shouldn't until I've cooled off a bit, but seriously.