WARNING! SPOILERS FOR DAYS!
You have been warned...
Anyways! Here's my theory on how Kairi can use her Keyblade.
In Days, Xion can use her Keyblade, and even though it's fake, Roxas lent his to her once, and she was able to use it.
In the end of Days, (spoilers are here.) we learn that Xion is Soras memory of Kairi or something like that.
Maybe, because Xion can use the Keyblade, Kairi can use it?
Unless Kairi using her Keyblade was a one off and she'll never use it again.
You have been warned...
Anyways! Here's my theory on how Kairi can use her Keyblade.
In Days, Xion can use her Keyblade, and even though it's fake, Roxas lent his to her once, and she was able to use it.
In the end of Days, (spoilers are here.) we learn that Xion is Soras memory of Kairi or something like that.
Maybe, because Xion can use the Keyblade, Kairi can use it?
Unless Kairi using her Keyblade was a one off and she'll never use it again.