<human>: Today my grandfather was admitted to the hospital. He thought he was dying. My 70yr old grandfather, recovering from stage IV lung cancer likely had a heart attack.

My mother, sister, and grandmother all went to visit today. I found this out while speaking to my grandmother on the phone, moments ago. She said that the entire time my sister was at the hospital visiting, she would not put her phone down. 

Now don't get me wrong. I get it. People like their phones. But for fucks sake, her grandfather is very ill and hospitalized. 

My grandmother voiced this concern today, along with telling me that she (my sister) failed tests at school and is too preoccupied with boys to think straight. BUT, she's 13. So, that's okay, right?

When do I worry? And, when I DO worry, how do I talk to her? How does one 'reach' a 13 year old?

Can you condense the text into a few key points?
<bot>: My sister is 13, and very typical at that. I'm afraid for her future because all she cares about is her cell phone and the boy across the classroom.