Explanation

She is living alone so no one to look after her. 

وہ اکیلی رہتی ہے اس لیے اس کی دیکھ بھال کرنے والا کوئی نہیں۔

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The first part of the sentence describes the subject that she lives alone and there is nobody to care for her.

So, the appropriate pronoun describes the absence of a person or people will be No one

Similarly, the pronoun that refers to the woman is her.

ND17-1-2023