So,

I was just talking about a similar situation a few days ago. I agree that discussions often silence people, but only as long as they allow themselves to be silent. In other words, she doesn’t have an obligation to include space for you…and you don’t have to abide by her prohibition against having the space to dream big (or talk about dreaming big).

I still think starting a discussion by saying, “I feel your pain and frustration, but I want to understand why you don’t want me to dream?,” might be effective?

I often find multiple and even contradictory things can hold elements of truth (shades of truth are not always linear)