YOU'RE LETTING HIM HAVE A LIGHTSABER!?!?!?! Rey stares at Han like he's a complete and utter lunatic. Which he is. Wanting to give his son a chance at redemption, sure, that's understandable. But giving him the lightsaber he tried to murder you with ... that's lunacy.

"...Fine. I'll go get it." Between now and actually getting her hands on Luke's lightsaber, she'll lose all enthusiasm for this plan, but at this exact moment, her concern is mostly that Kylo Ren not be the only person with a lightsaber.