If we could somehow do a wholesale saber replacement throughout and have her use Leia’s to replace Anakin’s which broke in TLJ, then Luke gives her his green one on Ach-To…that’d be an interesting experiment. But it might not work given how much dialogue is centered around “[Leia’s] brother’s saber.”
This would be definitely awesome, but there would also be a problem of how she obtained before going back to Lukes island, unless someones thought of how to pull that part off