Well, I can't say she's wrong when I think about it now, it's about different point of view, it's their normal practice in her company to give the other a phone call while they are off. Her point is that I never think about her, she expected I can understand her situation as she was working there for nearly 8 years. She went angry because I acted like I don't care how does she think.
Making a phone call is in the real life section for her I guess, it's different to the internet, so she doesn't think there's any problem.
Fortunately the argue was subsided in short time, otherwise it was going to be worse.
I think phone calls are included as well. But the point is more about disconnecting and then connecting with your partner or whoever you're spending time with.
Being "on call" is a savage situation I'd rather not have to contend with, but one which is pervasive in nearly all "lines" of work. People should have true times to themselves and not be in covert servitude outside of work.