Does what the questioner said, out of exasperation and mockery of the religion or its rulings, constitute disbelief that necessitates uttering the Two Testimonies and performing ghusl, given her knowledge that she was suffering from obsessive-compulsive disorder and that her exasperation was not in the realm of disbelief?

Malik's madhhab (definition) (school of thought) in this matter is strong, and it has been chosen by verifiers like Ibn Taymiyyah. There is no blame on whoever acts upon it, especially the one afflicted by whisperings (waswas). The thoughts that occurred to you bear no sin, do not necessitate uttering the two declarations of faith (Shahadatayn) or performing ghusl (definition), and they have not expelled you from Islam. Beware of whisperings in this regard, and you must strive against them no matter how numerous and frequent they become, for this is their only cure.