Hi P.,
hmmmm....your daughter's tantrums remind me of my son's.
He had a period of a couple of months where he would refuse to sit on his car seat, it was somewhere around last summer, he turned 2 this week. Out of nowhere, we put him on the seat once and he started kicking, trying to get off, crying, melting-down. I had to force him to get in, because we were sometimes in the street and he just wanted to jump off the car...or it was raining and we were both getting wet. I had to force him, he would cry, and cry, and cry and it broke my heart but we had to get back home from the pediatrician or get out of the rain, you name it. Once the crying stopped, I would try to talk to him (while driving....).
And then, one day, it just got better.
It was just a phase?
I had a feeling that Edouard just was bored of being placed in the carseat and not having a say; and getting strapped and not be able to move must not be fun either for an active toddler.
Maybe, since you know your girl, you can try some things with her to make her "like the car rides" again. Maybe start a little game at home with her, without even getting near the car? Maybe you can have her place you in a couch and pretend you are in the car seat and she's driving. It's amazing how children respond to games and play.
So, I don't have much advice to give other than to be patient with her and try to function as normal as possible. And, remember, this too shall pass.
Good luck - hope you can get your grocery shopping one this week!!!! =}
Ana Luisa