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she need a company who has COS (certificate of sponsorship) to sponsor overseas employees. if your father's company wants to hire her then company must have COS to hire her and must advertise job for 6 months and must pass labour market test.
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they need to apply 'authorisation to issue COS' in the Home Office to employ non EU employees for their business. it could take 8-10 weeks standard processing time for authorisation. Then time to advertise for 'labour market test'.