So it is about you and not your father, or even about you and your father. We all have or will have to experience this. Stop making the sad drama about yourself: no wonder many people choose to release themselves from pain by letting go when the family isn't around.
I'm going to try my best to show you the respect you CLEARLY didn't offer to the OP. The last thing they need to hear now, is "Get over it, stop being a whiny baby". When a person experiences a loss (especially when they were close to the person), it can be an incredibly painful. Add the idea of loving that person and it becomes even worse.
While you may have not experienced something like that, many people have/will in their lifetime. Losing a loved one isn't easy. When it comes to death, as we all know, there are stages we go through.
The best thing that one can do, is remember the person and continue on with their life, cherishing the memories, thinking back fondly on occasion, and realizing that any potential suffering they had is no longer an issue for them.
In a sense, she's grieving. It's totally acceptable. He just died, cut her some slack and let her grieve.
Your last comment was disgusting and completely unacceptable and inappropriate, Torpedo.