Coworkers was no filter

So of course everyone at work knows about my health issues and worries. Well I heard my very load coworker talking about me and my family. She said it was selfish of me to be with someone who already was a disabled child because if I died he'd be stuck having to raise 2 disabled kids and a child that should be on meds to calm him down. Everyone in the office could hear her. I stepped out and she went oh my gosh I said that to loud. I'm sorry. I simply said thanks for worrying about my family and went back into my office. She did get pulled into our boss's office.