I also disagree that it is too soon to talk about it with her. As a client it can be extremely triggering to be "forgotten" like that. I have compassion for her as there is obviously something serious going on to affect her work to such a degree but I also feel angry on your behalf. It isn't okay for that to happen to you repeatedly.
I am curious about how it is so hard for you to stick up for your own rights. (I mean I can't stick up for mine either but it easier to feel indignant for someone else right?) With old t and new t I can see that it seems easier for you to accept not-okay treatment from others than it is to protect yourself.