She was even nastier than Tony Soprano’s mother.
Elizabeth Tudor was no softy: “Cuz, call my Dad ‘Ornery’ one more time ...”.
You are perhaps confusing her with Mary Tudor, so-called "Bloody Mary" who has also been unfairly maligned in he popular mind due to polemics and propaganda rising out of the Reformation (more modern and calmer historical research has evened out the picture). Both of them were more hapless and unlucky than nasty and the offenses they were both executed for (especially Mary Queen of Scots) were entirely the work of advisers to whom they mistakenly placed their trust in.