Mushroom murder documentary

Just finished watching this. Didn't like the forensic psychologist's talk about the eating disorder helping to show that the woman had a particular mental disorder, because the only evidence of the eating problem was the woman using it to explain certain behaviours after the murder and it was never mentioned earlier in her life.

Also another thing I found interesting was that a motive was never discussed. I pereonally think she did it to try to punish her ex. She wanted to be accepted and loved and thought she would be losing that now her ex had left her, even though they didn't indicate that that would happen, and so if she couldn't have them, no one could, especially her ex.

That's what I think anyway, has anyone else watched it or followed the case and what do you think?