A short story about Alison (If you could help me with the grammar and spellin It would be great)

Alison read the note, smiled, and immediately put on her coat. She decided to go for a walk, so he could clear her mind in the street.
She was wandering through the streets of Southampton when, out of the blue, she realized that the handwriting was not from him. At this very moment, she was walking along the river, following a narrow path that continued through a dense forest. Right away, she felt a frightening sensation starting in her chest. She got panicked so she started running without looking the way she was choosing trough the woods.
She got lost and started crying for help. Then, Alison heard a loud but strange sound. It was almost as if someone were dragging his feet through the leaves. She recognized the pattern and realized that “the sound” was him, so she felt relieved.

My self-correction

A short story about Alison (If you could help me with the grammar and spellin (spelling) It would be great)

Alison read the note, smiled, and immediately put on her coat. She decided to go for a walk, so he (she) could clear her mind in the street.

She was wandering through the streets of Southampton when, out of the blue, she realizes (British English-realises) that the handwriting was not from him. Later as she was walking (by) the river, following a narrow path that continued through a dense forest she felt a frightening sensation starting in her chest. She panicked so she started running blindly without looking at where she was going t(h)rough the woods.

She realised that she was lost and started crying for help. Then, at that very moment Alison heard a loud but strange sound. It was almost as if someone were dragging (their) feet through the leaves. She soon recognized the pattern and realized that “the sound” was him, so she felt relieved. (Him? Who is this character? Did you mean "The sound was from her own feet?)