Tarīʿu expresses returning or turning in response to a stimulus. Tattaqī is the feminine singular imperfect of Form VIII ittaqā–yattaqī, meaning to protect oneself. Both verbs have the she-camel as their subject.
The first concerns response to a call, and the second defense. Ilā ṣawt al-muhīb identifies what she turns toward, while bi-dhī khuṣal supplies the means of protection. Translating both simply as “she moves” would miss the animal behavior in the verse.