It sounds awful to have so many interruptions and uncertainty. And it is so frustrating that things improved for awhile but have fallen back now. Phone interruptions should never happen. That is totally within her control. I have never had a session interrupted by a phone call. While you can't prevent the doorbell from ringing every time, it definitely seems like something could be done. Sessions not starting on time is also something under her control.

I think it is worth bringing it up to her but I think you have to know that while it may improve in the short term, it is likely to happen again. If that does happen then I think you have to make a decision.

What are you asking is totally reasonable. An occasional, extremely rare interruption is one thing. Life does get in the way sometimes, but this is more than this and how can it not affect the work you are doing?

I am sorry this is happening.