When I first saw this, I thought it was an old sketch from Fast Forward: from some angles, Gwen has an alarming resemblance to Jane Turner dressed as Matron Sloan from A Country Practice.
As you can see, the act of spoon playing is a very physical act requiring ongoing stamina, something that seemed to be pushed to its absolute limit at around 1:36 or so. I suspect the ostensibly random key change at 1:15 couldn’t have helped – I’m also guessing that this wasn’t part of the act, rather it was the house band having a bit of a laugh at the expense of an overambitious septuagenarian.
Still, despite these challenges, Gwen didn’t drop a single note. Or spoon for that matter.