Maybe your T thinks it's obvious that she's building your history for herself and maybe doesn't notice that you want her to be more clear with you about the things she does?

I think it was respectful of her to use a few minutes of your session to go over the appointment change. As evidenced in this forum, sooooooo many people freak out when things like that aren't done by the t in person. If you're ok with getting calls from reception to go over changes, just tell her that. She was giving you the respect of hearing it from her.