Sounds like you may need to work on assertiveness a bit. Have you asked your T to please turn off her phone before your session begins? If you have and she refuses without good reason, that would be her issue. But if you haven't established that boundary with her, that is something you could do to fix that problem. If you aren't speaking up in session about what you need to talk about, perhaps you could go in with a list or a journal and see if that would direct the session in your needed direction. It is okay to speak up for yourself and advocate for what you need from your therapist. That would be an important conversation to have.

Have you considered telling her you are considering leaving her? Perhaps you could go with a list, not of complaints, but of your needs and discuss this with her.