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Intonation decides, but the sentence is such that the only normal meaning is "кошка любит только одного человека - мою сестру".

About a girl, hated by dogs and humans:
Андрей

I cannot confirm...

So we get "маленькое чудовище" or "мелкая тварь" as possible options.

Impossible to refrain from posting:
Игорь Иртеньев | * * *