My 13 year old grandchild has been mad about everything since her grandfather died last year. Her grades are suffering and she has no interest in anything except playing on her phone. She has lived with us previously and still stays with us at least 3 days a week. She also stays here during school breaks. Her father moved to another state 10 years ago and sees her about 3 weekends a year. I believe she is the canary in the mine. We are lost without our loved one. I want to help her but do not know how. Please advise.