I agree, she's a textbook sociopath, so we shouldn't take anything she says at face value. But that said, the body of evidence presented by the police against her so far seems overwhelming and so far no evidence whatsoever has been presented that implicates anyone else. Only speculation.
My opinion is that speculation in a high profile case like this, here in Cambodia is very irresponsible. You don't need fire in Cambodia for a conviction, especially is a high profile case, just a bit of smoke is enough to get someone locked up in an absolute hellhole for a sentence that might as well be a death sentence. And what I see here is people making smoke.