It’s wonderful that she is supportive! Maybe try to explain her that the concept of a „safe space“ means a lot in a therapy. Zoom is difficult enough and requires more effort from both sides to create that kind of safe space. Maybe she will be more understanding if you explain that this is not so much about the topic in the session but more about an overall feeling. Talk to her! Good luck and all the best! (Plus a therapy session is about 45mins which is the length of about every episode of every show, shouldn’t be hard for her to get distracted in an episode of her favorite show.)