Where do we go from here - booster question for tall 7 year old

Hi all -
7yo DD is getting uncomfortable in her Radian - it is too tight for her in the shoulders. The headrest is as high as it can go and her shoulders just barely squeeze in under it and from side to side. She is about 52 inches tall and about 55 pounds (she is thin but, as a gymnast, has developed broad shoulders, apparently).
She primarily rides in DH's or Grandma's car in a Britax Frontier and is happy there.
She occasionally rides with me, but only for short rides, in my Nissan Leaf. We have 2 Radians in there (1 for DS) so that we can fit a bubble bum in the middle if we need to. So, I strongly prefer to not put another large(r) seat in there in case I need to fit a third kid.
So, what do you recommend? Is it time to switch to a LBB? And are there any LBB that are narrower than others so we can still fit 3 across (Radian, Bubble Bum, booster)? She has ridden on the BubbleBum for travel and/or carpool so knows how to sit and buckle properly and we only take my car for short trips, so there is no sleeping.
This is hard for me - btw the Radian and the Frontier I had envisioned 5-point harnessing forever and really didn't anticipate ever needing another seat.
I appreciate your recommendations!
Thanks!

For a typically developing kid, 7 is a perfectly good age to go to a backless booster.

You could get her a Harmony Youth Booster. It's narrow and should allow for a BubbleBum to fit in there still.

If you want to harness her longer you might be able to use a Sureride. Depending on how you set things up, that could leave enough room for a passenger in a backless or a five-stepper.

Unregistered said:

If you want to harness her longer you might be able to use a Sureride. Depending on how you set things up, that could leave enough room for a passenger in a backless or a five-stepper.

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