The Return of the Legitimate Daughter: the Poisonous Concubine of Hou Men

In her last life, she had her throne taken away from her, and died after being humiliated by her husband and concubine. When she was reborn, her personality changed drastically. Her aunt and concubine Bai Lianhua framed her at every turn, but she was no longer weak and fought back fiercely. The third prince tried his best to help her. She was happy with her grudge and was finally on the verge of revenge, but she began to be obstructed and framed by mysterious people. Who is the mysterious person behind this?