Such are the wonders of social networking that I've had more discussion of this on my Facebook page than on the blog; thank you to those who helped identify this magnificent lady as St Ursula. She was from Britain, though martyred at Cologne, hence the cross of St George flag which is a standard attribute.
Here are a couple more pictures of her.
A little Christmas quiz. Spotted in Farfa Abbey, in Italy.
And why does she appear to have the Cross of St George?