After a loved one passes, it is common for a grieving person to cocoon for a while. They may withdraw for awhile to regroup and remember.
They review memories of their loved one --- the good, the bad, the otherwise. This is an important step. After all, relationships with others help us to discover who we really are. It makes sense that their deaths help us to discover who we really are, too.
For some, a loved one's death may jumpstart thoughts about their own mortality, and they may begin to explore their spiritual beliefs and make a more conscious connection with their soul. They may also develop or seek spirit communication with their loved ones in Spirit for evidence of survival after so-called death.
Some people have the additional journey of coming to terms with how their loved ones passed (ie. sudden passing, long illness, murder, suicide, accident, etc.) This is normal as well. However, those locked unhappily in the 'how and why did it happen this way' seem to suffer from an internal mental loop of punishment.
To those that are looping like that: I encourage you to find a (hopefully graceful) way to let go of analyzing events with your mind. Your loved ones in Spirit want you to live gloriously and joyously.
I'm not telling you not to grieve and I don't have all the answers for you. But I do know that when a person remembers their spiritual and cosmic connection to all that is (both seen and unseen) and truly listens to their soul, they feel divine grace and comfort. This sometimes take patience and persistance, but it can be done.
Just like spiritual progression, grief is something that cannot be rushed. In my experience, there is no official timeframe for grief. Each person has to find what works for them and find it in their own time.
Bottomline: I feel that grief is not something to get over but rather something to move through.
Grief can be an opportunity to cocoon for a brief time, discover your spirit and the spirits of others in a new way, and emerge like the butterfly with 'wings' that give your soul flight for Life.