I'm a bad daughter

My me and my mum are close in the way that I call her and she would be there for me no matter what.

As much as I love my mum she calls me at least twice a day and gets defensive when I tell her I'm busy so I always take her calls.

What makes me feel rubbish is I'm so looking forward to when she goes away abroad for 9 days where she won't be able to call me so often.

I just feel so awful for looking forward to her not calling me all the time.

I know I should appreciate my mum so please don't need that lecture me on that.