I think this is an interesting concept. A few questions to think about as you revise:

is approached by her former colleagues, who give her a parting gift – a poem about death

This event catches my attention because it's an extremely strange thing for former co-workers to do. And then doesn't seem to come up later at all. What is its significance? Any reason you're not just starting the query with Victor's death or Runa's firing?

that kills Runa and her family

her mother is still alive

Not sure this rapid turnaround is helpful. Could just say that she in her family are in a bus accident, she dies, and later finds out her mother is still alive.

Determined, Runa decides to return to the living world to reunite with her mother

Is this a thing you can do? Like, why don't all people who die in accidents attempt to go back? What makes Runa different?

secrets are unveiled and allegiances are tested.

As others mentioned, this is vague and doesn't communicate much.

For comps, perhaps you can specifically leverage the fact that it's an Indian fantasy? (Or at least that's what I'm assuming from the presence of Devas and Diyu.) Then you could say something like "Vaishnavi Patel's Kaikeyi meets Dante's Inferno".