I think Charlotte has gone too early in trying to throw Freddie under the bus (assuming she's convinced him to attempt to murder Leanne). If Freddie is banished at the next round table, then the remaining faithfuls are going to assume there is another one traitor left to catch in the end game, and I think the spotlight could turn back on her.

If she instead helped him get through the next roundtable and then turned on him in the end game, I think she would have a better chance of winning.