My Bhabhi conceived after 6 years of marriage after great difficulty. Unfortunately she delivered a stillborn. She is now devastated and refuses to talk to anyone about it. She also blames herself for this.It has been 5 months now. I love her very much and am out of ways to help her through this time.

Why don't you plan a holiday with her. Take her out on a trip. A new environment and place would keep her thoughts off from what has gone by. Take her around the new place, but at the same time do not go overboard, acknowledge her pain. Let her do the talking once she feels like talking. Read this link, it may be of help in how you can bring to accept it. https://www.seleni.org/about/news/how-to-support-someone-after-a-stillbirth