The significance of this statement that the kitten is "she's a little lion." is one that connote that the kitten is strong and not weak and a supporter of the team since she as the owner is also supporting the theme.
The book from which the above quote was taken from is known as a praise for refugee and it was written by Alan Gratz.
The word kitten is one that is gotten from from a Middle English word known to be kitoun and they are known to be the children of an cats.
Note that a lot of fans often name themselves after the team they are supporting and as such she ascribed the kitten to a lion.
Hence, The significance of this statement that the kitten is "she's a little lion." is one that connote that the kitten is strong and not weak and a supporter of the team since she as the owner is also supporting the theme.
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