The Time-streams Revisited
For every familiar time stream there are infinite numbers of unfamiliar ones, for every event each possibility that can happen does happen across countless alternative realities and in the case of Rachel Lang there is no exception.
In a much darker time stream following rampage at the Bing Mansion, she would have killed Jesse Ryan before realising his innocence. Consumed with guilt and grief and a sense of irony, she finally went insane and as her half sister before her used her telekinesis to collapse the mansion atop herself.
But there are more favourable time streams out there in the infinity of the universe, many which undoubtedly would appear unfamiliar. In the majority of these alternate realities perhaps at a rate of 85%, Rachel Lang unlike her half sister whom she never met faced greater odds of surviving.
In a more favourable time stream Rachel along with Jesse Ryan and Sue Snell would have survived the events at the Bing Mansion. Needing no further persuasion about her origins and awesome power that she carried within her, Rachel would finally agree to Sue's offer of help in getting her powers under control and subsequently would have been smuggled out of town by Sue to an unknown destination while everyone else would presume that she - Rachel was dead*1.
In yet another favourable time stream, Rachel and Jesse's relationship would have been delayed long enough to spare her from being humiliated in public at the after football party. This in turn would have allowed Sue Snell all the time she needed to break Barbara Lang out of Arkham Asylum and execute a critical rendezvous with Rachel in which her mother Barbara would reveal to her the truth about her father. Subsequently Rachel would have undoubtedly discovered her ties to her long-lost, deceased, half sister Carrie White and persuaded to get the help necessary to manage her condition. Additionally in this unfamiliar universe the Carlin Devils would have delivered a catastrophic defeat on the Bates Bulldogs making it the worst opener in history. After a string of successive losses the Bates Bulldogs would have been disqualified as a professional college football team.
For Jesse Ryan it would have cost him his scholarship and he would be briefly forced to sell cars at his father's business before a second opportunity would present itself enabling him to continue into further education or a professional career of his choice. In this time stream Rachel and Jesse's relationship was destined to begin in College and safely away from the scrutiny of his friends.
*1 this happened in the 2002 remake of Carrie, I eventually figured that if Rachel and Sue had survived the events of The Rage Carrie 2 then it would be logical that the ending would have been similar.