Kelly's GOT IT FIGURED

it means that Kelly has it figured...

I still don't understand the meaning of the sentence.

For instance, what does "it" refer to?

Thanks again for your kind help.

Whatever it is that she has got figured.

Example: Teacher: "Class, what is 5,784,375
+4,318,537
----------------
Teacher: "O.K., class. Kelly's got it figured."

Paok

I see you are posting questions about the word "got" and how it is used. I think you are confused about the idioms.

It can mean a form of the verb "have" - He's got a cold

As a slang idiom, forms of "get" can have other meanings when used as a linking verb:
We got beat by the other team yesterday.
He got screwed over on that deal.
His cold has gotten worse since yesterday.

It can mean to understand: I finally got the answer. He didn't get the joke.

To possess: He's got red hair.

Many more definitions of the word "get" can be found in your dictionary.