After you fight and spare Toriel there is a way to encounter her before the end of a pacifist run. If you go back through the ruins after sparing her and go to the flower patch at the very beginning she will be standing by the flowers. You can talk to her and she mostly just insists that you should leave the ruins and shouldn't have bothered to come back and talk to her before leaving.
Also at first, I didn't think this was possible because I watched Jacksepticeyes playthrough and he said that he couldn't find her when he went back through the ruins. I'm guessing he didn't go to the flower patch at the very beginning of the game.
If you know anything else about Toriel's character feel free to comment :)
I would like to know more paths you can take and things you can learn about the game.
Also, if you would like to see videos of me doing these things tell me in the comment section down below, I would love to make a video for you guys :)I know this chapter is shorter than the others and that's because heaps of people know about most of Toriel's interactions.
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Secrets I Found in Undertale
RandomOf course these aren't secrets for everybody but I thought that I'd share things that I discovered on my own while playing Undertale. So far I haven't found much related to Gaster so probably nothing about him will be mentioned.