The carving was pointing away from where that howl came from earlier. Which works out smashingly for me! Rarity thought the farther from those wolves she gets, the better. She followed its direction keeping her eyes open for other markings as well as any sign of her pursuers, she didn't have go far until she found another one. It had a slightly altered course from the previous one, it still took her away from the direction the beasts went, so follow it she did. 