My first suggestion is a vet check. It almost sounds like it might be a seizure disorder or even could have been a bee sting??? Get thee hence to a vet.
As far as riding in the car, get a plastic crate and have her ride in that. I never have understood the whole "dog loose in the car" thing. It is dangerous in an accident or if the dog panics for some reason. None of my dogs ever ride loose in the car or the truck. I crate them for travel.
There was an article a few years back on dog seat belts. They do nothing. In every crash test the seat belt separated the the dog became a missile. The other issue with a seat belt for a dog is they can chew them. Just put a crate in the car and put the dog in the crate. Plastic crates are better in an accident. Wire crates come apart and can impale the dog (or you). Plastic crates tend to bounce around and take the hits.. the dog bounces around too, but the plastic crates absorb quite a lot of impact.
I have upgraded my crate in the truck to this because it locks and I can cable lock it to my truck so some "do gooder" cannot break in to "rescue" my dog (the tailgate also locks). The crate is secure in the bed of the truck under an insulated/ventilated truck cap. It was quite expensive. Zinger Dog Crates
As far as riding in the car, get a plastic crate and have her ride in that. I never have understood the whole "dog loose in the car" thing. It is dangerous in an accident or if the dog panics for some reason. None of my dogs ever ride loose in the car or the truck. I crate them for travel.
There was an article a few years back on dog seat belts. They do nothing. In every crash test the seat belt separated the the dog became a missile. The other issue with a seat belt for a dog is they can chew them. Just put a crate in the car and put the dog in the crate. Plastic crates are better in an accident. Wire crates come apart and can impale the dog (or you). Plastic crates tend to bounce around and take the hits.. the dog bounces around too, but the plastic crates absorb quite a lot of impact.
I have upgraded my crate in the truck to this because it locks and I can cable lock it to my truck so some "do gooder" cannot break in to "rescue" my dog (the tailgate also locks). The crate is secure in the bed of the truck under an insulated/ventilated truck cap. It was quite expensive. Zinger Dog Crates