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.)

You got a lot of pragmatic and wonderful advice here but I really have to ask: is your girlfriend against you seeing a therapist? My partner is a therapist and during Covid he also had to switch to zoom and I was working from home as well. We were in different rooms of course but whenever I even came close to his office I put earbuds in, same for his supervisions or own therapy sessions- I would feel really uncomfortable hearing something so private! What is going on in your relationship?