Acting out because of the loss of a parent?

My much older sister just recently lost her husband to terminal brain cancer. She has three children ages 23, 20, and 16. Her 16 year old daughter (my neice) has been acting out a lot lately, at school and at home. Could this possibly be related to the loss of her father? Any advice?Acting out because of the loss of a parent?
It's most likely due to the loss of her dad. She probably should go into grief counseling. It would help her a lot. She is going through so much right now and probably feels she has no one she can turn too. Doesn't want to tell mom or siblings because she wants to be ';strong'; for them. So she is showing her grief in the only way a teen knows how to show it.Acting out because of the loss of a parent?
Grief is a terrible thing, very hard to deal with. Her father died. She's probably suffering very badly. I'd look into some therapy or grief counseling to help her through this very hard time in her life.
yes, she needs counseling with her mom and for her grief

fashion makeup