A VERY BIG THANK YOU.
A very big thank you to all of you that took the time to answer my previous post regarding this "blasted" Schengen Agreement and the 90/180 rule.
What we did was to cut our first holiday short by 2 days buy rebooking ferry (£100 more expense) and then rebooking 2 days less on Air B&B (£70 refund). So for £30 my wife can travel back for a further 5 days in Spain.
Viva Espania.