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Welcome to Just Answer, I am a practicing solicitor in England and Wales and I will be dealing with your case today.
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Your friend can apply for British citizenship ,if she has indefinite leave to remain /settled status in the UK.
She can apply online using the below weblink-
Yes, She can apply for British nationality, if she has Indefinite leave to remain.
She would need her Life in the UK test pass certificate and knowledge of English language proof as well