Thanks for your question.
Has your partner been on a workers visa for the whole of the 6 year period she has lived in the UK?
Okay, presumably she has registered with the worker registration scheme as a national of lituhania.
If she has been exercising treaty rights (ie. working, studying, living) in the UK for 5 years then she can apply to be naturalised as a British Citizen. She is advised to do this immediately because there are no rules coming in to force next July which may affect her by increasing the time she must spend here.
She will need to apply using Form AN1, available for download from the UKBA webstie. She will have to pass an knowledge of life and language in the UK test and undergo the citizenship ceremony pledging allegiance to the crown. Once naturalised she could apply for a UK passport.
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