No. Gotmilk mentioned the bag and the duct tape, her possession may have been enough if she were the only personwith access to it, but she wasn't. DNA/Fingerprints aren't the only way to prove use, but unfortunately the prosecution didn't have the other methods available as proof either.
It's not enough to have a dead body and to have a 'murder weapon'. If you can't put that 'weapon' in a suspect's hand, you don't have anything. That being said, even though I believe she's guilty and should rot in hell, I think the jury made the right choice under law with the evidence presented.
And no, you can't convict because of someone's behavior. And as for her lies, she was found guilty on her four counts of giving law enforcement false info.