Question Agile escaping 3yo

[mamabearof3]

My very trim, flexible & agile RF 3.25yo has started unbuckling or sliding the chest clip down and putting her arms out of the straps of her new Contender while on the road. I thought our talks about safety had worked & it had stopped as she wasn't getting out anymore until her sister saw her chilling with her arms out on the freeway.

What are my options outside of FFing her or putting her in a buttoned up shirt with sewn up sleeves? I wanted to RF her until spring & getting in & out of the car is such a challenge as it is. She is a fourth child & we have places we have to be. Ugh!

She is behind the driver so my kids & the carpool kids can load safely passenger side of my 8 passenger Odyssey. Is there a mirror I can safely use to keep an eye on her? Or are they a danger due to rebound?

Thanks,
Mama bear to 4
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[babyherder]

Hopefully the button up shirt with sewn up sleeves would only last for a few rides until she decides it's better to keep her arms in the harness than have to wear the shirt. When my nanny girl did this I got a soft mirror. Once she knew I could see her she stopped trying to escape pretty quick.