East India company got its license cancelled in the year 1858 after first war of indian independence.?

so control of India came under direct British crown, means rule of King or Queen of England and Viceroy was appointed to rule as kings or queens representative in India. So India came under direct British crown in 1858. So King or queen must be the ruler of colony India, then why British parliament conferred Queen Victoria the title "Empress of India" in the year 1877, when already she was the ruler or Empress in 1858 itself? What is the speciality in this title? what special powers would queen get after assuming this title? Pls clarify?