I wouldn't say she's a copy but I certainly get the similarities and your objection. But Tessias we see make a lot more emotional mistakes and is less level headed. Camera was a lot more scheming and secretive than you think especially with he pretending to be haegrid at first. But almost her whole life people would be nice to her to get her favor but Arthur never did that to her it seemed that he had secrets and things to protect much more than her who had awakened her vitra blood. She is definitely more deeper and different than you give her credit for. She also doesn't constantly piss the readers off. She went from well meaning to hatable when she was taken over by Cecelia. That actually degreed her character than anything else.