My Past Life Enemy Was My Father?

Oh, that cursed baby talk!!!
Riana Le Merdy, the last remaining fire mage of the Kingdom of Zantar, only realizes that she has been used by her fake family all her life just before her death.
At the brink of death, the god of fire grants her one more chance, and she vows to take her revenge as she closes her eyes...
"Please save me! Save me! Take Ahtang and go!"
She regresses to a three-year-old who can't even move properly, let alone fight! She hates this baby talk more than death, but she needs to stay alive to get her revenge!
Moreover, the person who saved Riana is the second son of the Hallias family, her enemy from her previous life...!?
"You are my daughter. Do whatever you want."
"Brother is here. It's okay. No one can touch you. No one."
"Riana, my beloved child."
"Why can't you marry your brother again?"
Sorry, but weren't we enemies in our past life...?
"If I become king, I'll give you the kingdom."
And now a prince of a nation is clinging to her?
Goodbye to the puppet life of being used, the adorable youngest of the Hallias family, Riana's fiery and lovely second life begins!