A singer, in 1546 she was for a short time the mistress of the Holy Roman Emperor Charles V, who was in Regensburg for the meeting of the Imperial Diet.

On 24 February 1547 Blomberg gave birth to John of Austria, who was almost immediately taken from her and sent to be raised in Spain.

In 1551 she moved to Brussels with her husband where Kegel was responsible for the equipment of the imperial mercenary army.

At the request of the governor of the Netherlands, the Duke of Alba, she was granted a pension by King Philip II of Spain (her oldest son's agnate half-brother).

In November 1576 Blomberg met her son John of Austria for the only time since his birth.