Also known as... telling a story from memory ("Dear Zoo" by Rod Campbell).
She is mumbling a lot so it's hard to understand what she is saying, but most of the time she is repeating the same thing over and over.
"I wrote to the zoo to send me a pet. They sent me a pet. [Insert animal here]. It was too big I sent him back."
It's not quite the right words. But she does obviously remember some lines from the story.