Rarity knew enough about camping and nature between Applejack and Fluttershy to know she needed to find a place where she could be easily found. There was still the problem of actually being spotted, assuming she finds a suitable place for rescuing. She decided to file that thought away for later. Rarity may not know fire spells like her two magic-talented friends, but a few sparks from her horn and a little dry brush should do the trick.