How do you paraphrase the poem she walks in beauty?

Well, you could say "this woman is pure, lovely, and kind." ... although, paraphrasing kind of destroys the whole purpose of poetry. But whatever. We'll blame it on your teacher. Paraphrase huh?

1.

Her beauty reminds me if the night sky, Unlike the day which is bright and gaudy her face reminds me of all that is best between day and night

2

If she were in any brighter light or in any more darkness it would be the wrong shade of light to adequately show her beautiful face which shows her sweet feelings.

3

Her beautiful face and calm smile show she is innocent, good and at peace.

Wikipedia says this about She Walks in Beauty:

Byron is said to have written the poem after meeting his cousin Lady Anne Wilmot Horton in black mourning clothes, which, when combined with her pale skin and "raven tresses" (black hair), reminded him of stars and the night. The poem claims this lovely outer appearance as a sign of her inner beauty and purity. This was a popular theme of Renaissance and Medieval poetry.

This poem is not necessarily a love poem, but more of a celebration of the subject's beauty. Some critics have said that Byron fell passionately in love with his cousin and wrote this poem for her. He met her for the first time while she was in mourning over the death of a loved one. Thus, in modest black dress (hence the allusions to darkness, with the light referring to her beauty) Lord Byron encountered his cousin, known for her great beauty, and was taken aback. Nowhere in the poem does the poet mention or allude to love; he is merely commenting on the subject's beauty.