perment visa

Hi my name is Peter, and Iam on the Brazilian forum, because I live in the state of Rio
My wife and I meet in England some 6 years ago, and after getting married she got her permeant visa, for England, but after she was granted, the permeant visa, we had a holiday in brazil, and I fell in love with brazil, and decided to stay in brazil penalty
now if I remember right, if my wife leaves  the UK for more that 6 mouths in one year, she will lose the permeant visa
She been out of the UK more that  3 years
would any know if she has lost, the visa, if so, would she be able to reapply for a new one 
ok meany thanks

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