Sorry, but I don't think the friend is being insensitive as others do !
Your friend's life has carried on, along with her daughter, while yours has been on hold after the very sad loss of your own.
I know you feel that no one else has suffered as you have, and maybe that is true, but your friend, just wants for you to be a friend and commiserate with her. Unless you have lost a child of your own, you can't realise that your grieving in some form will carry on until your last breath. It does not mean that you cannot be supportive to other people who are struggling with dealing with problems in their own life, no matter how minor you feel them to be!
Take a deep breath, give your friend the time that she currently feels she needs - she may have real fears that once her daughter is away from her, that something drastic may happen to her as did your daughter.