https://www.especialneeds.com/shop/special-need...

I don't have any info on how for her to let you put on the seat belt. However, I do have a suggestion for safety while the car is moving. Last year I got my son a buckleroo. It's a piece of plastic that goes over the seat belt and keeps him from pushing the red seat belt release button. You use a car key or house key in the narrow slot to release the seat belt. Plus side is it's on $10.

Thanks I’ll look into it but even when I strap her down she still manage to get out of the seat belt

Hi! I was wondering if your daughter is receiving applied behavior analysis (ABA) therapy. If not, you might want to consider and look for an in-home ABA services to support her needs. The ABA team will support and can teach you on how to desensitize your child with unfamiliar things around her using positive reinforcement. 😉