Thanks for your question.
She would have to apply for EEA family permit before coming to the UK. She would have to apply using form EEA2 to the nearest British Embassy to where she is at the time of making the application. It is valid for 5 years and endorsed in her passport.
She must provide a valid passport and evidence that you are married. YOu can download the form from the UKBA website.
Applications are aimed to be processed by the UKBA within 2-3 months of the application being made, but there is quite a bit of tolreance in this as it depends on how busy the UKBA are at the time and whether they find grounds to object to the application itself.
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