I'm starting to suspect that the original Canaria wasn't actually that bad and got all of the blame shifted on her to cover all of that embezzlement. The maid neglect her to the point that it's a legitimate threat to her life yet she's supposed to have had massive expenses? The events with the fever probably happened the same.
The tears in the execution weren't just because she was going to die, but because she thought Caesar was the only person in the world who gave a damn about her.