I think it likely that Maleficent, who is also a powerful sorceress, could have preserved her own memories from the dark curse. Since she was never in favor or Regina enacting it in the first place, I would love to see Malefient’s SB counterpart take on Regina and help Emma in some way. It would be very interesting for Maleficent’s SB self to tip off Emma about how to break the sleeping curse, since Maleficent is the one who created it in the first place to use against Sleeping Beauty. She’d certainly know how to break her own curse.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy