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Perseverance could remember everything except for her own beginnings. Because of the CONTINUE, she remembered things. But the first time she had used CONTINUE was when she had fallen underground, alone and afraid. Broken and hurting, the CONTINUE led to her being able to keep alive, but it came with the price of the memories of the mage before her. That mage held onto every other mage's memories as well, and they all tried to cram themselves into her brain. In the process, Perseverance had forgotten her before. She wasn't quite sure as to who she was, or how she'd gotten down here. All she knew was her name and that everything she'd just learned was too much.
Perseverance's first memories of the Underground were not pleasant. All she knew was pain. But Toriel came and fixed her up- fixed everything but her mind.
The only thing that Perseverance knew in this new world (knew through her own learning, that is) was that Toriel was good. She was safe and she cared greatly for Perseverance. So she stayed with her for two and a half years, learning about the new world she'd come into, and attempting to push away the memories of the others.
One day, her mother left the ruins and Perseverance followed behind, wanting to see where she went. Instead, she found a door. The door led out into the snow. She remembered snow, though she didn't know if the memory was hers or someone else’s. But the snow was calling to her, so she stepped out, and the door slammed shut behind her.
She stayed there, pounding on the door for hours, crying. Her mother never came, and a tall skeleton with holes in the palms of his hands found her instead.
At least, she's pretty sure that's what happened. All the memories tend to get jumbled up together, sometimes.