AIO for not letting this go?

I had this friend, her and i were inseparable atleast that is what i thought we've known eachother since we were 6 so we go WAY BACK yet somehow during the first highschool years, we got really close.. she was more of an extrovert and i was the exact opposite she seemed to hangout w almost everyone and i just had around 3-4 friends this one time we had this marathon being conducted via our school and we met new people i made a new friend,introduced them to eachother and not trying to execuse myself or smth but i was on my period that day and i have iron deficiency, low blood pressure and my thyroid is on borderline so my stamina can be quite low yet for her i was present that day she saw how slow i was so she took the new friend and ran i was left all alone w no energy and no company, i collapsed and later while we were going home she pretended nothing had happened and we were fine, even went to the arcade together w her sibling (who was 3 years younger than us) and both of them indirectly started making fun of me but i just brushed it off her sister made fun of my cleft chin and my friend knew that i was always insecure of my chin but she instead laughed and said "oh! She said it to your face" even after entering a public vehicle to go home i was wearing a headphone yet i believe they both were making fun of me even the guy sitting nect to me gave me a pity look so after a while i maintained my distance from her eventually forgave her but there was no confrontation within but she later did smth worse to my other friend and that was when i drew the line and blocked her from everywhere yet she has been trying to reachout to me..(it has been 2 years after the incident)