Once D'd or legally separated I'm of the opinion that my time with my son is our time together, not my W's or her friends. I suppose it depends on what the agreement is (50/50, more or less?). Especially if I was to only see my son 1-2x/week I'd want that to be our time.
For item #1 - you can tell her you'd like to be part of the process of finding a psychologist. To me it's one of those things that are a bit of trial and error (finding a good therapist).
Item #2 - yes you can let her bring it up tomorrow night if she chooses. You aren't stopping her from discussing it.
Item #3 - making accommodations is fine if it's going both ways. It'll make it easier in the future. However, this is part of divorce. Personally, I wouldn't want to see my Ex on my time with my son (if it comes to that). It's hard when you are still trying to DB but it you can't be afraid to stand up for what you think is right...maybe it's part of setting boundaries.
Nothing you do will matter while your W's heart is cold. Take the high road but stand up for yourself. Detach and focus on your own growth. If she comes out of her fog she'll see things differently down the road...way down the road.
H 37 W 31 S 2
T: 7 M: 4
BD 12/18 Separated 2/19 Living back together 04/06/2019 W Moved out again 07/15/2019