Ruby was fine with Dean taking the final shot if thats how it went down. That didn't entirely interfere with what Sam was doing. Sam was there fighting like the leader he could be. The leader he would be, using his abilities and if that meant he pulled her out then thats what he'd do, and even if he wasn't ready for that he wasn't defenceless. She hadn't left him defenceless.
She'd stepped back and was waiting now with John and Dean and Castiel, just a little ways away from the showdown. Killing Lilin making sure it was just the Bitch and Sam. Making sure if he didn't pull her, that Dean had a shot.
She worked furiously, eyes clouded black, killing Lilin her knife slashing into them with infernal force and ending them, but they just kept coming, more and more of them. She was trying to keep out of Lilith's sight for now, no sense getting in her way when she could so easily send her back, even being this close was scaring her. But still Ruby who had no pretences about her own cowardice, was here.
Because Sam needed her. And because she'd cast her lot in with him and his family. Whatever that might mean.