Bike for my wife

Any suggestion on this, my wife last time she was on a bike was over a year ago for less than 5 miles on a MTB, however we are heading to Isle of Mull next year myself and a few friends to do the 45km sportive and a weeks holiday too.
However my wife i thinking about joining us on the sportive originally was just for going about mull after the sportive, however quite please that she is giving it a go.
Anyway the question is this I have my winter bike / turbo trainer bike a Planet X RT-58 so could ger her to use this if i put bigger tyres on it.
The other option is a Planet X Kaffenback which is a commuter so bigger tyres / and a bit comfier , i can get this for £200ish.So would it be okay for a sportive and general use.
So what do i go for?, whats the better option, they both fit her.
Also i got her on the turbo trainer and emulated a local 3mile run to show her what she needs to do in order to get into fitness for it, done 3m in 20 mins, buts thats the first go, so is it fee-sable what she is thinking?
However my wife i thinking about joining us on the sportive originally was just for going about mull after the sportive, however quite please that she is giving it a go.
Anyway the question is this I have my winter bike / turbo trainer bike a Planet X RT-58 so could ger her to use this if i put bigger tyres on it.
The other option is a Planet X Kaffenback which is a commuter so bigger tyres / and a bit comfier , i can get this for £200ish.So would it be okay for a sportive and general use.
So what do i go for?, whats the better option, they both fit her.
Also i got her on the turbo trainer and emulated a local 3mile run to show her what she needs to do in order to get into fitness for it, done 3m in 20 mins, buts thats the first go, so is it fee-sable what she is thinking?
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For 45K ride you need the best you can get!!!
The OP said 45Km (27 miles), doubt that needs a massive outlay. I agree with Bobbinogs, get her down to the bike shop and let her choose.
Ribble Gran Fondo, Campagnolo Centaur (winter bike)
Van Raam 'O' Pair
Land Rover (really nasty weather
I am not sure. You have no chance.
Depends on her geometry