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Now as for the Greek goddess Hera.
Based on that psychology book, quite a lot can be said about her, most of which I won't type out. The most important thing about her is that she is The Wife. Nothing else. This is in the center of her personality. She can be a mother as this comes with the title of being The Wife, but she'll never be The Mother (which title should go to Demeter, I did not read her chapter now).
To be The Wife she needs The Husband whom will be more important than any children of hers, not to mention some previous wife's... And Hera gets into fits of jealousy, and can be quite vindictive and destructive - rarely towards the husband, but sometimes against own children.
But she has no other reason to harm anyone, just those she perceives as rivals for attention of the husband. If she becomes a widow, she loses the core of her characteristic, she's not The Wife anymore. Beyond other things this also could trigger seeking revenge on those who are at fault in the loss of the husband - or at least whom she perceives the culpable.
She doesn't care much about other male attention. And she doesn't care much about other transgressions of her husband, and she frequently places the interest of the husband over her own.
How much this really fits onto the "evil devouring mother" stereotype? Or the Snow White/Cinderella tale? Some. But then if we go along with the Greek goddess metaphor one goddess rarely covers the personality of a woman. So there might be other goddesses in play.
For example the step-mom of Snow White was jealous of her looks in general, which could imply she feared she'll distract the attention of other males. This is not really Hera-like.
I might read more.