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If the relationship has broken down and her partners reports this to the home office then her visa will be curtailed meaning that she would need to look at another visa route to stay in the U.K.
She will be eligible after 5 years for Indefinite leave to remain in the U.K.
She would be required to make the application for Indefinite leave to remain.
She must still be with partner to qualify for permanent residence otherwise she will not qualify.
That’s her personal choice if wishing to do so.