Thanks for the responses =)
I'm going to try get hold of some rescue remedy. Hopefully that in conjunction with the feliway may calm her down (feliway on its own doesn't seem to have any effect on her). Will also invest in some cat toys.
Unfortunately the mesh cages aren't up to safety requirements for flights - here they must use the cages with the metal doors that have me concerned =\
She quite enjoys being in the carrier - just not when it is moving. It's a game to her until it starts moving, then she just REALLY wants out. I'm very concerned that she's going to do some damage to her paws - she seems intent on just about declawing herself the way she wraps her claws around the bars and pulls =(
And yeah - they seriously recommend not drugging them (but will do so if necessary). I REALLY want to avoid it. If I could leave her out of the cage in the car I'd just drive the 14 hours over with her - but it's no longer legal here to have cats out of cages when in a car.
We have a vet visit this Friday to have checkups for all three cats and to discuss what they think we can do for Linden. I'll try the rescue remedy and feliway and catnip toys for that small trip and see how she goes! Keep fingies crossed