Compared to those useless fools who could only wag their tongues, Umbridge undoubtedly knew better how to ingratiate herself with her superiors. If she could help Fudge get Harry Potter expelled as he wished, she believed she would earn Fudge's trust and be entrusted with greater responsibilities.
As for everything else, they were merely minor problems.
To mobilize Azkaban's Dementors, she first needed a transfer order approved by Fudge. That was hardly difficult.
In order to strike at Dumbledore, Fudge had thrown open convenient doors for those he trusted, allowing Umbridge to easily find a loophole.
That very day, Umbridge hurried to Azkaban with the transfer order in hand.
To avoid leaving behind incriminating evidence, Umbridge did not use the Ministry of Magic's ships. Instead, she traveled directly to Azkaban prison—a place countless wizards avoided at all costs—using Apparition and a flying broomstick.
The location of Azkaban had been cleverly concealed by wizards. Ordinary wizards had no idea where it was, nor would anyone take an interest in the place. Yet within the Ministry of Magic, it was no secret. Umbridge easily retrieved the files she needed.
Azkaban prison's defenses were not actually as tight as imagined. No dark wizard would be foolish enough to attempt a prison break, because the island was guarded by vast numbers of Dementors. Any wizard who dared raid the prison would likely become food for the Dementors.
Soaked through by the storm surrounding the island, Umbridge arrived at the dark island at the eye of the tempest, grumbling and cursing all the way.
The moment she reached the sky above the island, she discovered in horror that Dementors were flooding toward her. Umbridge hurriedly summoned her Patronus, giving herself a little more courage.
Yes, a Patronus.
It was truly difficult to imagine that Umbridge,