Small winged high back booster car seat

[justanothermanicmonday21]

My daughter has now outgrown her baby seat, I am looking to get a high backed booster, I already have a maxi cosi rodifix? But the wings are very large and made of polystyrene, I've found as the older kids are climbing across the seat they have leant on these and i am sure it's no longer safe so want to get a new one but one perhaps that is a bit more solid on the sides or that isn't as wide as I have three children across the back.

All high backed boosters are pretty flimsy in the side wings, if these are damaged then it would be a good idea to replace as they won't provide as much protection.

Maybe you can put her seat in the middle so it won't be climbed over?

How old is she? Is she average or above/below for height and weight?

She's nearly 4 but quite tall, her head is over the seat headrest now which is why I'm looking at next stage seats however need to double check her weight etc too. The rodifix was her older sisters but as I said pretty sure it needs to be thrown and a new one brought now. I would be happier with a 5 point harness one still bit her current one is a stage 0/1 and we need the next one

The middle seat is not a full seat if that makes sense and doesn't have isofix so would rather it be on the edge.