I would do the flight all the way, if that is at all possible. On the plane, you can hold her in your lap, nurse her at will, walk up and down the aisles.
In the car, you run the risk of getting part way there, and her having a toxic meltdown. This happened to us with DD1 when she was younger (admittedly a bit younger than your daughter will be, but still). We took a 4 hour trip up to Door County in Wisconsin. She made it there all right. But coming home a couple of days later, she decided she had had it with the car, and it took us over 9 hours to get home. It was a nightmare.
You didn't mention what kind of vehicle you have. That would make a difference. I would be more inclined to risk it if I had a van, because it's more comfortable, and you can get back there easier.
Also, how does she do in general in the car? Again, that would make a big difference in my decision.
Good luck, it sounds like you have a fun trip planned!
Bec
In the car, you run the risk of getting part way there, and her having a toxic meltdown. This happened to us with DD1 when she was younger (admittedly a bit younger than your daughter will be, but still). We took a 4 hour trip up to Door County in Wisconsin. She made it there all right. But coming home a couple of days later, she decided she had had it with the car, and it took us over 9 hours to get home. It was a nightmare.
You didn't mention what kind of vehicle you have. That would make a difference. I would be more inclined to risk it if I had a van, because it's more comfortable, and you can get back there easier.
Also, how does she do in general in the car? Again, that would make a big difference in my decision.
Good luck, it sounds like you have a fun trip planned!
Bec