....another thing you might want to have her do (if you know the approximate positioning of the cast) is get in your van with her leg in that position to make sure you can adjust the seat enough to accomodate it, and/or check your tiedown placement to make sure she'll have enough room.
i promise you thats not the kind of thing you'd like to find out in the parking lot the day of. ;-D
and resin patio chair-i couldnt think of the right word...and the headband (maybe thats not what the are called these days)--i meant those new kind of bands with the silicone that go all they way around the head--that silicone strip is what makes it work and be fixed enough.