ElementExpressionFunctionSubjectShe-camel — لَهَا هِبَابٌMount moving rapidly under guidanceComparison markerكَأَنَّهَاConnects two distinct scenesImageصَهْبَاء ... جَهَامُهَاLight cloud hurried by a southerly windShared qualityخِفَّت and سُرْعَتLightness and swift movement
The attached pronoun in ka-annahā returns to the she-camel. The similarity is in the manner of motion, not a literal identity between animal and cloud.