Thank you all, so much.. reading all of your generously supportive, friendly, informative and understanding replies has reassured me that I am doing the right thing. I have decided to, as discombobulated put it, slow fade.. Completely disassociating myself from this feels like the best approach for now.. I have carefully written a draft message and saved it incase she ever messages me with something unnerving. For now, I have ended all contact and removed her from my socials as Motts suggested. It had to be done.

KBMK, I wish you the very best with your friend, may your future be bright and beautiful regardless of what happens.
Bill3, I am so happy to hear from you, I notice how you have always been here for me whenever I may need support from PC.. Thank you, I wish you the very best in life

These replies are all so beautifully written, I am really grateful for the time and thought you have all put into them thank you so much. Be safe and be happy!