The FL marries a sleg man and she is later killed by his mistress. She transmigrates to cultivation and the back to her to the time she was in high school where she still had contact with ML (surnamed Bo). I am not sure his background but he is somewhat powerful and from martial arts family. FL does well in school and also becomes a contestant in an acting variety show. She lives alone as her parents are divorced and have their own families. That is all I remember...
After Transmigrating Into the Cultivation World, the School Topper Was Reborn? it fits part of what you are looking for... Edit: wait I know one that fits better... The Reincarnated Goddess is Fierce Is it this one? I thought I had read it but this one is on webnovel and I don't read on there so I'm not sure.