I watched it. Eh. I lean towards not guilty. I think ultimately you're responsible for your own actions. It sucks because they were obviously messed up and probably could have been happier and healthier with each other, but it didn't work out. I can see where a 15 month sentence is a little too lenient but her life is basically over. She'll forever be the girl who badgered her depressed boyfriend into killing himself.
The parents here are some real losers as well. His parents were abusive, and hers seemed absolutely clueless about anything. The documentary barely acknowledged them and certainly didn't do them any favors. Where were they when all this was going on?
Anti-depressant medications scare me. A lot of side effects and can really mess with you.