IN 4 MOVES:
25. Qd7+ Kf8
26. Bc5+ Ne7
27. Qxe7 Kg8
28. Qg7#
25. Qd7+ Kf8
26. Bc5+ Ne7
27. Qxe7 Kg8
28. Nxh6#
25. Qd7+ Kf8
26. Bc5+ Ne7
27. Bxe7+ Kg8
28. Nxh6#
- my 1st example - 3 Q's moves
- my 2nd example - 2 Q's moves
- my 3rd example - 1 Q's move
But puzzle above... Nice! 
Enjoy to dance with pieces! :) For fun, move the Queen just twice. :)