Relax, Tony ... your wife's application was lodged well ahead of her spousal visa's expiry, so there's absolutely NO question whatsoever of her being asked to leave the UK while it's still under process.
... I can well-understand the pressure you're under, because two months is a God awful time to wait for an outcome - albeit by NO means unusual when dealing with the Home Office - especially at this time of year. I'm confident, however, that you'll soon have a positive result!
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