she was experimenting on which is Bloodshed!Gaster, which attempted to end this nightmare and death threats by taking perseverance and determination to find a way to cause a mess, through several times a try, she begin insane to inject it, mass violent killing spree, and kills the real "her" itself.

Undertale: Insanity by UTF.

Undertale: A Recalibrated Episode by me.

Undertale by Toby Fox.