Dude what is your problem? At this point you just want to be right and "win" the conversation. The point is, she's already gotten her kids vaccinated so shaming her for something you think caused this isn't helping anything. Being a parent is hard. There is so much information being whirled around and you just want what's best for your kids. 

The daughter is three, born right around COVID. You don't think that has anything to do with a speech delay? The twins are premature, obviously linked to that as well. And how many kids get vaccinated who aren't going through this? Not to mention that the criteria for autism has become lower and lower. What get you labeled today wouldn't have gotten you labeled twenty years ago. And I have mixed feelings on vaccines so it's not like I'm blindly sticking up for them. I'm just saying, what are you helping right now with your replies? You're trying to fill a agenda for yourself versus offering helpful suggestions. She's doing her best at this point and has done what she feels is right.