the fl body og is switched after birth, but one the og owner of fl body got really sick and somebody give the grandma the jade pedant and if i remember correctly after that the fl reincarneted in the girl body. If i wrong sorry, i didn't read the novel and the translate sometimes "interesthing" (but at last free ლ(´ڡ`ლ) )
it was said in some chapter (I don't really remember which one tho) that the clan members can resurrect the dead and fl confirmed it a bit (not openly saying yes but stating that people looking for this power made the clan go into hiding) so it would be reasonable that they believed she reincarnated

i dont understand 1st they said she was exchanged after birth .. then she came back to original family .. now they are saying she is from some clan taken away when she was born.. so what is her actual family?