Question

why the hyphen sign is used here
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Answer 1

The hyphen (‐) is a punctuation mark used to join words and to separate syllables of a single word. The use of hyphens is called hyphenation. The hyphen should not be confused with dashes (‒, –, —, ―), which are longer and have different uses, or with the minus sign (−), which is also longer in some contexts.

Answer 2

hey it is used to give force to her feeling. If it would be without hyphen it wouod be like a simple sentence but the narrator wants the reader to highlight that feeling.
nothing else