It's because she's Welsh. Many English people are notoriously anti-Welsh. Just look at Neil Kinnock and the way the press went after him for being Welsh, largely contributing to his election loss.
The press went after Kinnock because he was a pillock and a crap politician. Still good to see he stuck to his socialist beliefs and didn't take advantage to get his wife and son and himself high profile well paying jobs that made him millions. Oh ! actually he did !