The type of figurative language she used was Foreshadowing.
Explanation:
How she used this type of figurative language is, she gave her readers different hints in certain parts of the paragraphs/text, and her doing this is giving the reader a signal and predictions of what will be happening next or anytime soon.
Answer: If you want you can make the poem rhyme. I personally find it easier to do so. Also, what type of poem is it? Is it a haiku? I can give you more tips if I know what type of poem.