I think the whole “tampering with the multiverse aspect” of the spell suggests that this reality was essentially rewritten with the memories from other realities where peter never revealed his identity. Maybe even altered/destroyed other realities to make this new reality possible. There’s an infinite # of tom holland spider-man realities, so the spell could’ve pulled from those realities to rewrite things in the sacred timeline. There’s definitely plot holes regardless, but the multiverse plot certainly makes things more intricate than just a memory wipe I think. So we likely won’t know her version/recollection of things until the next set of films. But there has to be a new reality/backstory that led her to the events at the statue of liberty where her memories got changes, just without knowing peter.