Crib sleeping!!

My LO will be two months on the 7th and she HATES to sleep in her bassinet or her crib.. She has reflux and i think thats why she doesnt like to be flat on her back.. So shes been sleeping in her rock n play, but during the day she will take naps in her bassinet but when its time for bed she wants nothing to do with it.. I dont know how to transition her into her crib !! FTM and it kills me to let her cry jt out.. Any advice ?