The other thread was about turning a child BACK RF at 4, who had already been FF. To me, this is a very different situation.
I'm thinking we will have to see if the My Ride (or whatever they eventually release it as) really has a tall enough shell to RF to 40. If so, I will keep my current RFer RF to 40 for sure-- but I would let my older children who have already been FF have the choice as to whether or not to RF.
In your situation, if you can find and afford a RF seat to keep her RF, I'd do it.
I'm thinking we will have to see if the My Ride (or whatever they eventually release it as) really has a tall enough shell to RF to 40. If so, I will keep my current RFer RF to 40 for sure-- but I would let my older children who have already been FF have the choice as to whether or not to RF.
In your situation, if you can find and afford a RF seat to keep her RF, I'd do it.