Originally Posted by dddd
Let's see her in the mud with a broken rib or collarbone...
pulleys and rope, absolutely (2 pulleys, 2 prussik rope, 20-40m of 8mm rope, 2-4 carabiners, to setup a Z-drag).
She is probably smart enough not to be driving a big heavy bike through the mud! There is no way to be prepared for everything. If you are riding alone, it is only common sense to not put yourself in the position where you will have to self rescue. And if you are injured a better piece of equipment might be a "SPOT Satellite GPS Messenger", or cell phone if you have a cell signal.