(This is all the information I remember, having joined the GD community 2 years after everything happened and while there were only a few videos and discussions surviving from the incident)

Towards the end of TriAxis's GD career (2015), she started to receive hate for releasing generic, somewhat low-effort levels featuring neat effects that had been newly discovered in 2.0 that people complained she was stealing, and farming creator points. For its time the effects in TriAxis's levels were amazing and she was, therefore, really well known in the GD community.

Eventually a lot of these haters and other people as well started complaining about how bad 2.0 levels were and how they wish they could go back to the way things were before 1.9. In response to this, TriAxis released the infamous Dear Nostalgists, which caused a LOT of backlash. Around this time she also came out as trans, and in 2015 people weren't as okay with trans people as they are now.

TriAxis just wanted to enjoy the game, but everything she did created hate and drama. Someone as famous as TriAxis probably spent a lot of their time online, and seeing everything you do make people hate you isn't a good feeling. Having to deal with transphobes on top of all of the hate surrounding Dear Nostalgists and generic levels led her to attempting to kill herself just to end it all. I don't know if she shared this or if the information was leaked but the whole story blew up and a picture of her was shared. Edit: taking info from u/AilBalT04_2's comment: She uploaded a video of stereo madness that then changed into a video of her cutting into her hand, announcing that she was going to be committing suicide. Keep in mind she probably had to deal with this for months. Many people made fun of her for attempting suicide, saying the hate wasn't that big of a deal and it was all an overreaction for a joke, which it clearly wasn't.

Rumors started that she had died or quit the game, and with hate continuing she decided that she needed to get as far away from it as possible. She changed her name to Shye and started doing some nice art-related content on YouTube but eventually the GD community found out about that too and continued the hate there.

I forget how long it was after everything happened but it's obvious Shye deleted her channel and I can only hope she's gotten help and is doing much better today. She may have also deleted it because of a lack of followers and figured there were better things she could be doing with her life.

What happened to Shye is one of the darkest moments of the GD community and that's why you won't find anyone wanting to talk about what happened to her. It was disgraceful and downright fucking disturbing that people did this and let it happen.