“After episode eight, I said ‘this is a traitors’ win, it’s going to be a slightly boring finale’,” Collier added.
Now, she says she “cannot wait” for the finale: “It’s going to be a fabulous final.”
Ranganathan survived earlier elimination when his close friend and fellow comedian Rob Beckett was picked off by the traitors in a face-to-face murder.
After discovering his fate, Beckett said: “I know one thing – my boy Romesh will avenge my death and he will get them.”
Joe Marler, a former England International rugby player from Heathfield, East Sussex, made it to the final of the first celebrity series before being pipped to the prize by traitor Alan Carr.
Marler previously told BBC South East the latest season was “carnage”.
“Richard E Grant coming out like that, straight off the bat – I’m hooked.”
Dr Gemma Graham, head of the psychology department at the University of Brighton, told BBC Radio Sussex the series is a “perfect game of deception”.
“As the viewers, we know who the traitors are so we’re screaming at the TV going what are you doing?”, she added.
Collier agreed: “It’s really easy from the sofa, so easy.
“Not so much when you’re in there.”
The 80-minute grand final of The Celebrity Traitors season two airs at 20:00 GMT on BBC One and BBC iPlayer.
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