Sarah Copyright Problems with Brian

My thought about this copyright between Brian and Sarah....Brian has the right to copyright because Sarah voluntarily gave the poem as a gift to him. Now Sarah, demands or thinks she need to have the same level as Brian..that is fame, money and be known as in music records. But, the reason that she cant have this royalties...because when she gave the poem to him Brian that means its the poem is now to Brian. Now Brian is property of this poem, music and all what he wants to do with it.