One thing I've found that helps me a lot when I'm struggling to tell T something is to tell him I'm struggling. We talk about what's making it difficult without talking about what it is exactly. He almost always pinpoints exactly why I'm finding it hard to talk about and we work on the reason for a bit. Once we've done that, it's almost anti-climactic to actually tell him the original thing.

For example, if I have something I'm ashamed of that I need to tell him, I'll say "I need to tell you something, but I feel a lot of shame around it and it's very hard." We talk about how shame is fear of another person's reaction and he reminds me that he won't ever judge me for anything I tell him. It makes it easier to tell him the thing I'm ashamed of.

Maybe that can work for you, too. Tell her you want to tell her something, but you're very anxious about doing that.