It's so Cool to Be Reborn as the Queen Mother

Before my rebirth, I was a humble palace maid. I was given poisoned wine and died tragically in the cold palace. When I opened my eyes again, I was the young queen mother on the sick bed, and the emperor was my nominal "son". The people who bullied me and humiliated me in my previous life are now kneeling at my feet and trembling. I picked up the bird's nest porridge and chuckled: "I remember that the last time you fed me was arsenic?" Just as I was about to deal with the swarm of ants, I saw the powerful regent holding my hand: "If the Queen Mother is ill, I will let the entire Imperial Hospital be buried with her."