Tell her. Whatever it is, whatever you think her reaction will be, even if you’re sure she already knows- tell her. Good or bad, just say it. Let her know what you’re thinking, how you’re feeling, what you’re doing. Just tell her.
It was difficult for me to find an aac text to speech app on my iPhone that isn’t for children but I was finally able to find one and it’s free. You can adjust the tone and pitch of the voice and there are many accents that you can choose from.
You can even save your most used phrases.