Sorry, missed seeing that there were no back seats so my advice wasn’t too useful.

I’m no expert, just once heard the safest place in a crash was behind the driver and the most dangerous the front passenger seat. I guess wherever her carrier can be secured works.

And I always put her side-on so in case of a sudden stop her shoulder or flank hopefully takes the bump rather than her head or spine.

Gabapentin mixes nicely into wet food or gooey tube treat 👍