Your first problem is that no one in the actual criminal proceeding was considering her a murderer, no one who knows what they word actually means was accusing her of that. They were instead accusing her of manslaughter, which, by definition, is not
murder. You have built up a straw man and knocked it down, congratulations.
Second, a consensus is not reality, I don't believe anyone is arguing the legality of what she has done, if we were, you would be correct. We are arguing the morality of the situation.
Third, killing someone doesn't mean you're a bad person by default, else all soldiers would be completely reviled by society (well, more of society I guess), her being a "sociable, charming and entirely well-behaved individual" has nothing to do with the problem at hand, other than the case being unconventional. I would strongly propose that most people charged with manslaughter, not murder, are probably also well-behaved members of society. This can contribute to why they were charged with manslaughter, not murder.
Finally, now that all the bullshit you are pulling has been called out. If you at all believe that, inherently, suicide is wrong, and should not be encouraged, she is a contemptible for doing so. A contemptible person not in her right mind because she herself is mentally ill? Maybe, but contemptible nonetheless.