She knew where the Dementors were stationed at that time - it was visiting hours - and the guard patrol schedules. And as she was keyed to Azkaban she could now freely use magic inside the perimeter. A Disillusionment charm was so simple she almost laughed as she rowed to the shore and basically walked to right below Draco’s cell window. He was only on the fourth floor due to being a low-risk prisoner so a simple levitation and then a