That's excessive and really disrespectful.

Scarlet's idea is the right answer, but a person doesn't have to be 'good' all the time, and a reasonable confrontation isn't always effective with those with such unreasonable behavior. So your strategy might help ensure she gets the message loud and clear.

I say this because I can almost guarantee this has been brought to her attention before, and she still does it anyway. I'm ok that my T and doctors answer their cell phone once in awhile, but this is obnoxious.

I think however you do it will be standing up for yourself, so please do confront her.