hard mode is not canon in the slightest it's a silly bonus joke scenario
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I mean how would Eve eat Toriel twice? lol. Unless she escaped the first time or something and just forgave Eve I guess? Personally I think Hard Mode is probably only canon so much as Eve falling into The Ruins, meeting Toriel and arriving at her house. Not so much the eating Toriel in her chair part or the two extra routes. So Hard Mode is probably only canon on a very loose level.
I'm not sure you're understanding what I'm saying here. The events in Hard Mode are likely only canon in that Eve obviously had to have fallen into the Underground, met Toriel and somehow crossed the ruins to get to her house and end up in bed at the start of said scenario.
That's it. So if anything in Hard Mode is canon, then that's the only part that is and nothing else.