Dropping in the "I've buried one child" argument is disgusting. Losing a child is just beyond horrific, but it's not a card to play to win arguments! It just comes across as "I've suffered more than you so your opinion means nothing."
Also, that point about Raven not being able to cope if she couldn't see forwards is crap. Kids don't know seeing forwards is an option if they've never been in that position, or seen siblings etc forward facing. She went on about Raven hating the car seat, and the pram, from a very early age, when she would still have been in an infant carrier. She's said herself she assumed Ember would be the same, and she was surprised when that wasn't the case. I'm sure there was a post or story one day about sitting in the car for ages before actually setting off, waiting for Raven to make the choice to sit in her car seat, because she didn't want to force her to do something she didn't want to.
She's just trying to justify her own parenting choices again.