Mrs. Kelly would LOVE a homemade card or note.  
That is her #1 favorite present!
A donation of a book to the classroom library would be perfect.
Here are a few books that Kindergartners would love:
  • My New Friend Is So Fun (an elephant & piggie book) by Mo Willems
  • Planet Kindergarten by Sue Ganz-Schmitt
  • AH HA by Jeff Mack
  • Frog and Fly by Jeff Mack
  • Mr. Putter and Tabby Drop the Ball by Cynthia Rylant
  • Mr. Putter and Tabby Turn the Page by Cynthia Rylant
  • Leroy Ninker Saddles Up by Kate DiCamillo
  • Guji Guji by Chih-Yuan Chen