I’m pretty sure it’s Swaggy C, though she was pretty cagy about that in the conversations I witnessed, and she’s said different things to different people.
As for her ultimate plan, she’s talked a bit about a backdoor plan for someone.
She hasn’t been entirely up front with people she claims to be loyal to in the house.
That’s no surprise, considering she proved her loyalties are flexible when Tyler convinced her to vote Steve out, resulting in Sam’s safety.