Hello Deer Heart: I read you post. It sounds to me like you have an excellent relationship with Cat. I see no reason why you shouldn't mention it whenever she makes a mistake with regard to her use of pronouns. As Hopelesspoppy mentioned, the concept of personal pronouns has not been in our brains long enough for it to come naturally. I'll tell you that I'm 67 now. I've been transgender all my life, although I never did anything about it. (It's a long story.) But anyway I don't have a command of the concept of personal pronouns or of all of the gender identity labels that are in use nowadays. So, from my perspective, your therapist's mistakes are understandable & should be corrected... gently & with compassion... I wish you well...