Hey no problem...get the rant out the way, it really helps to talk about it
I kno what you are talking about, i once had the same thing, in the begining i would want my mum to come with me, but sit outside not inside with me, i felt a bit uncomfortable with her in the appointment with me, seeing as it was about "me" not her, so i had to sit down with her and explain id rather she sat outside whilst i go in by myself, she understood, maybe you could do the same with your mum? or mention that you wouldnt go in with her on her appointments (shoe on the other foot) usually works,
Sometimes when im having my space bubble days (brain fogs) i ask her to come in with me, as i kno i wont remember anything of the convo, either that or i tell her everything at 100 mph when i get out of the appointment then she knows lol and i can ask her if i forget.
Im guessing she just wants to be there for you as much as she can, but doesnt know when to back off a little,
Hope you get to speak to her, let us know how you get on