Yeah. YANBU.
I have a friend who is lovely - but i have to tread carefully around the subject of her son. I've known her for 4/5 years and her DS is now 21. Strapping 6 footer, and we live in quiet countryside.
At 19/20 she still expected a phone call if he wasn't coming straight home from work. (not to do with food - he did his own catering). If he was going to be out past 11 or if he was going to stay round a friend's for the night. At 17/18 she would 'ban' him from doing certain (mundane) things, and refused to take him/collect him. (no buses) Which worked until he learned to drive.
Then he had to have a tracker on his phone and she would check it often during the day, weekends ect, and text him if he went off the expected schedule. He would often not answer and this would cause her to either not speak to him when he did come home or start great shouting matches.
She would also regularly search his room.
I don't know where any of this came from! He was a good kid. DH is the dad, marriage is fine.
I never knew what to say! I would gently try to suggest she didn't do any of the above! But y'know, what can you do as an outsider? I could see the more she clung to him the further away he backed.
She's eased off a bit now - but only because he moved out!
I have older DDS - i never expect to have any where near this level of control/imput on their whereabouts.