I agree that ‘just Rey’ works without Rey Palpatine - having her say it in a proud manner rather than a sad one demonstrates she’s found herself - but only if you cut the shots of her pausing to stare at the ghosts. Otherwise it would feel like a conscious rejection of the Skywalkers, in my view. In a Rey Palpatine edit you could suggest she’s looking at them for support with her choice to reject her Palpatine lineage, but without that context, I don’t think it would feel right.