My personal favorite tidbit is where she changed the title from "YouTubes hate me so let's have a mental breakdown" to "[...] THEN a beautiful build up".
It's not clear from the verbal context whether she considers the self harm the relapse or if the relapse is for something different. However, at the very beginning she appears to be holding a lighter and then takes a huff of something at 00:00:55-ish and immediately takes a drink of water. She starts pacing around the room, talking slightly talks faster, with less vocal fry, and has shorter pauses between sentences after this point (the faster talking and shorter pauses could be attributed to getting engaged with a particular topic). She also admits to picking at her face despite not having any pimples. From these clues I think we can rule out drugs that are relatively free of impurities or downers. Does she have a historical drug of choice?