Way back when I drew this I forgot to color Toriel in.
Unfortunately for Toriel, this plan also backfired on her too. Temmie remembered that Toriel was supposed to help her put a stove on top of a higher shelf in her shop because it's totally smart to put a very heavy appliance on higher shelving... Toriel forgot to help her so Temmie used a trinket she keeps in her shop to shrink down problematic customers and used it on Toriel, which she then swallowed her down the same way Frisk did. Toriel ain't having a good day so far.