It's not too long, but it is a couple of hours drive away. She also gets very stressed just going to a cattery (or anywhere else) so I think setting her up a safe place within the home while things are getting loaded on the truck will probably be the best option for her, that will at least minimise the number of times she is moved.
The Feliway is just a pheremone spray not an actual drug.
I'm sure there are plenty of things, but I don't care enough about them to bring them to mind, let alone type them out.