Yes this is where the shunning starts. Right from that announcement. If she goes to the bathroom during the meeting right after that announcement she'll get glares from those in the seats and no one in the hallway or bathroom will even acknowledge she's there. Yes it would be very embarrassing and humiliating for her, and after the meeting she'll be expected to scurry away with her head down and try to navigate her way out of the KH with people in her way without actually saying a word to them.
I didn't turn up for my announcement. I was already 100% out and have no intention of playing their game. Although i did go to the occasional meeting just so i could see my 2yo daughter.
Funny you should mention shunning, only a few hours ago i was getting on a bus with my little girl and an elder and his wife were getting off. I smiled and said "hello" like any normal human being would, to which the elder replied "hello <daughters name>" and walked right past me.