(May you) Always keep the rubber side down (and the chrome side up) ...
Edit: and since this is a friend of yours, you might consider getting her a little "gremlin bell" to hang on her motorcycle. It keeps evil road spirits from attaching themselves to your friend's bike in an attempt to harm her, but it has to be given as a present by someone. In other words: the rider shouldn't buy it him/herself. It works best when given by someone like a friend.
I'm certainly not superstitious, but I have one on each of my bikes. :-)
Edit II: just for fun, here's the last paragraph from a story called "The Legend of the Gremlin Bell":
When you purchase a gremlin bell and place it on your bike, it offers protection. If you receive the gremlin bell as a gift, the powerful magic of the bell is doubled. You want the bell to be low to the ground, but not so low it will catch on obstacles and come off. Place it as forward as
possible, so the road gremlins will jump away when they first hear you.