i saw a post a bit ago that i cannot for the life of me re-find
that talked about how a long while ago, dana said the blight parents were less black and white than they seemed. and speculated that because of s3 getting cut, we only got to learn more about alador, and odalia's character had to be simplified. and that maybe we'd learn that she herself came from a toxic household
and i think that could've been such a cool concept, to show that she has her reasons for being Like That and isn't just evil out of nowhere. BUT to never have her actions be justified or minimized. and then have her not even TRY to grow or redeem herself.
and that could be played in stark contrast to how amity, alador, and (to a lesser extent) the twins were abused and ended up perpetuating the cycle of abuse, but learned the error of their ways and made the conscious decision to break that cycle. that contrast could really drive home that whole family's theme of "just because you were abused doesn't mean it is acceptable for you to abuse others"
and that could've worked SO WELL with her oracle magic and its connections to ghosts. maybe have her necklace be an heirloom tied to the previous generations of blights (i'm gonna assume blight was her surname and alador married into the family for this post). it could be shown connecting her to the ghosts of the people who abused her (and the people who abused them and so on). we could see the ghosts speaking to her, tormenting and abusing her, through that necklace.
we've already seen her use her necklace, which could be revealed to be the symbol of the abuse she faced, to abuse her children and husband. that could be made into a metaphor for her using her own past as an abuse victim to hurt others.
the way the ghosts of her ancestors speak to her through her mind via the necklace could be paralleled to the necklace she made amity wear in escaping expulsion so that she could speak to her through her mind. and she'd be given the chance to follow in amity's footsteps, to break the necklace that was allowing her own abusers to invade her mind. but odalia wouldn't take that chance. she'd continue clinging to the necklace, refusing to let go of the power it gave her (a power she mostly uses just to abuse others). refusing to break both the necklace and the cycle of abuse.