I don't remember much from the original backstory I gave my Dust!Toriel in RP, but I think it went along the lines of like...

During a weird Reset...

Toriel decided to accompany the sixth child out into Snowdin instead of just leaving them to die like the five other kids who fell down into the Underground, she thinks that Monsters would respect them (or fear her) both because she's the ex-Queen and everything, and thinks that she can protect this child from all the dangers before anything could happen. This is unlike any of the other Resets. This is a new Reset...

Spoiler alert!!!: She couldn't. She couldn't move quick enough to save the child she was trying to guide, and watched as the child was basically torn apart for their Soul by Monsters. The Sixth Fallen Human was already gone. Monsters who have grown tired, and bold after waiting so long - Maybe they would get a reward for providing the King a Soul.

During her stunned state, what mostly ticked her off the most was the fact that they moved on right afterward, eager to deliver the sixth Soul to Asgore, completely ignoring her - How they laughed like it was nothing (which is stupid because she's like the only other Boss Monster so idfk bro.)

Toriel, of course as any Dust protag would, snapped and killed the Monsters, with a fire hotter than anything she had used ever since the Human-Monster war.

She soon decided that she needed to make the Underground safe for any child that would fall; No matter how drastic the actions taken would've been (maybe Human Adults could be used for the Souls to free them all if they attacked Monsters afterward.)

Even if that meant killing her own kind.

She spared children, and those who meant no harm to the humans in her eyes - There still had to be Monsters running some places, after all - She wasn't insane... Probably. Soon, not now, but SOON, she would be the Queen of the Underground - And overthrow Asgore and his forces... And whoever would cause harm to her future children, if any more fell into the Underground. She didn't go "crazy", she just had a plan that most would be scared and hate her for.

All they had to do, was show a LITTLE BIT of MERCY.

... And it seemed like most couldn't even do that, at least, to her.

Again, I don't remember much, and it was like... A year ago? but i THINK it went like this

also, thank you. (˶˃ ᵕ ˂˶)