Interesting development. Let me see if I got it about right..
Soo.. Horned Girl was madly in love with Atsali. Atsali liked her very much too, best friends, but not in "that" way. Horned Girl -apparently (to Atsali)- kills herself over it, Atsali feels guilty to a traumatic level. Shuts it away.
Nadette professes her "love" (or "lust") for Atsali, and -again- Atsali doesn't feel about Nadette in "that way" but as a good friend/Sister. And Atsali is deadly afraid -traumatic as her earlier experience was- that "it" will happen again, ripping open the vault with all those feelings she thought she had put behind lock&key.
And Nadette? Well.. She's Friend zoned. Not an enviable place to be. Being "in love" messes-up the Friendship bit in no uncertain way. poor (yet brave, stating het love openly) Nadette, poor Atsali.
Well now. Hów to convince Atsali that the suicide of her bestie probably wasn't Atsali's fault. Suicides (as i understand it from my Shrink-filled family. Every family-gathering could just as well be a gathering of he faculty of Clinical Psychology
I am the "outlier" being a tech-head) are véry seldomly the result of óne single issue of a person.
I grew up in the -relative- security of a smaller community, with a small (lefty-liberal)High-School, where trouble was spotted and dealt with right away by our great teachers. Where teachers and parents stood together in support of the pupils. I have not experienced suicides in my direct surroundings, and as such, I call myself lucky. But I can wholly imagine that the suicide of someone that was infatuated with you, but who you still liked very much, can mess-up a person pretty bad.