A married girl committed suicide due to extreme mental and physical torture of her husband and in-laws.

Answer

While suicide is haraam and the perpetrator of it is liable for severe punishment, we cannot say what is or what will be the fate of the girl who had committed suicide due to the torture she was being subjected to. One can only make dua and ask Allah Ta'ala to forgive her. Allah Ta'ala is Just and Merciful. He will not commit the slightest injustice to His servants. Allah Ta'ala will decree only what is just for the girl.