Seeing as this name came from a combination of Maria and Magdalene, then the name's true meaning is "Daughter of Maria/Mary". Magdalene means "Woman of Magdala" from Magda of Magdala and -lene which apparently means "of" like for example names of Arabian origins ending in -ez which means "son/daughter of". Combining the Mar from Maria and the -lene from Magdalene should give the name Marlene this meaning "Daughter of Maria/Mary". Besides, "Woman of Maria" sounds silly.