Friends should i accept her friend request ?

She and i were friends on facebook...i considered her more than a friend..she was like a sister to me...when she was down i lifted her up several times..but she never wanted to meet me..only chat on social media...i trusted her like anything..told all my secrets to her...to me she was more than a real sister(i dont have one) but 2 years ago she blocked me from all social media over a small dispute saying that she had known all along that i wanted to use her for my selfish reasons(i liked her best friend and she knew it)..whenever i tried to make up with her(i had her contact no which is same)...she insulted me and called me loser,she hates me,mentally retarded and what not...this after all good things i have done for her.i begged for her forgiveness several times and she kicked me when i was down..i was literally in depression for several months....for last 1.5 years my life has taken a turn for better(thank you God) and i have forgotten about her completely..i am motivated by my determination to prove myself to the world..but yesterday i found that she has sent me a friend request....i was shocked beyond belief..thinking boy..tables do turn..everyone salutes a rising sun...i discussed it my friends and they said have some self respect..don't add her..another one is saying play hard to get(accept her request after 1 week)...i have not forgotten about things she did to me....but a part of me wants to add her and make her jealous by watching my success...... what should i do..