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she does not need to wait for 3 months to visit in UK.
European countries and UK both are not connect with each other for visa purposes.
she can come to UK straight away.
if an applicant spends some time in Spain or Europe it will not affect UK visit. Uk has affiliation with Europe but UK is is not included in Europe.
But yes, if she wants to visit any other European country then she will have to wait for 3 months but not for UK.
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