Is saying "it's normal" about a forbidden act considered an internal justification for the sin, and does it require ghusl for repentance from it?

The questioner suffers from waswasah (obsessive whispering), and its cure lies in striving against the self, cutting off these thoughts, and turning away from them, because waswasah is a severe illness and a chronic disease. The istihlal (considering lawful) that leads to disbelief is believing something to be lawful that has been unanimously agreed upon as unlawful, whose ruling is clear, and regarding which no ambiguity remains, such as considering pork or zina (unlawful sexual intercourse) to be lawful. What crosses her mind, such as the word "normal" concerning forbidden or disliked things, does not make her someone who considers the forbidden to be lawful, and she should not pay attention to these whisperings.