Brining it up in public

I was just in H&R Block asking about getting my taxes done. And my mom asks out of nowhere if I can get tax credits for having been pregnant almost all of last year. I told her under my breath that no I can't and that it doesn't matter, yet she continues on and keeps talking. The lady asks if she was stillborn and I had to say yes. I was in a totally normal state of mind and then I almost started crying in the middle of damn H&R Block!!
WTH?!