Although, this is something you can never really "get over", losing some one you care about never is, be free to mourn, to weep over her. Also, tell her stories to people, to your boys, to your friends, to your nieces and nephews, to anyone who will listen. It helps keep a part alive in you.

Do something creative in her honour, write, paint, play music, sing, something for her...this last has really helped me on numerous occasions, as it helped me work through my own writhing feelings. Maybe just write her a letter every once in a while...tell her what's going on...and so on, even though she will never read it. The result is to help you through the grieving process.

Take it easy, my friend.