Thanks for your question.
In order to obtain a UK passport she would first have to obtain a spouse visa then remain in the UK for two years. She would then have to apply for Indefinite Leave to remain then wait a further 12 months before applying for naturalisation as a UK citizen.
However, she can only apply for a Spouse Visa (ie. Settlement) if it is intended that you shall reside in the UK permanently. This means you must intend to spend more than 6 months a year here. Additionally in order to successfully apply for ILR she must not have spent more than 36 days outside the UK during the two year residence period before applying for ILR. Though there is a degree of flexibility in this your current plans for where you shall live would make her ineligibile.
If it is intended that you will spend 4 months of the year in the UK then I would think that the most appropriate form of visa application for her would be a 2 or 5 year multi-entry visitor's visa.
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