An Ona-themed birthday puzzle

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Across
  1. 1. a tres minus dos game
  2. 4. Ona is good at this subject
  3. 6. Ona's shiny night friend
  4. 8. Ona's sparkly friend
  5. 10. furry musical instrument?
  6. 11. Ona's sky friend
  7. 12. It has ups and downs
  8. 14. the last single-digit age
  9. 15. She's a whirly wheel while doing this
  10. 17. Ona could get into this when she plays it
  11. 18. she rhymes with June
  12. 19. some of Ona's ancestors on her mother's side
Down
  1. 2. she is unique!
  2. 3. Don't you believe me?
  3. 5. I want to _______!
  4. 7. Ona's always-new school
  5. 9. she's snave in a mirror
  6. 13. first syllable of a brown game
  7. 16. Going up the hard way