Outaishi-sama, Watashi Kondo Koso Anata ni Korosaretakunain desu!: Seijo ni Hamerareta Binbou Reijou, Nidome wa Kushizashi Kaihishimasu

Not-so-wealthy noble young lady, Liesel, is set up by the foul-natured Blessed one and killed by her betrothed, the crown prince. Yet, when she awakens, she isn't in the afterlife. Instead, she's a child again with a second chance at life! This time around, she's changing her fate by becoming a powerful, talented magician in order to stay as far away as possible from the Crown Prince and the Blessed One. At least, that's how it was supposed to go... This time around, those who used to be enemies oddly approach her, and events that differ from how she recalls them keep occurring...

(Source: K Manga)