Excellent analysis by the way. I won't comment on the abandonment issues as I think you've captured those emotions pretty spot on there. I will, however, add to the final points you've made regarding acceptance from an avoidant partner.
In all their years growing up, I think it's safe to say, that Shiva gave her the attention (even if it was mean spirited) that no other person in Somnath did. It was always in some way shape or form a taunt, but it was attention nonetheless. And in a way, that attention always led to "positive" results for her --> Dev's attention. So, maybe as some sort of operant conditioning (think Pavlov's dogs for those of you who studied psychology), I think she personally went through the pain of Shiva's taunts to get the love/attention from Dev.
Now that Dev has been reduced to just a figment of her imagination, I am thinking that she craves all the attention she can from Shiva. It'll remind her of her past, before marriage, when she was still comforted by the fact that she had her family (Maasi Ma, Mausa Pa, Anita Di). Now, she's stuck in a loveless marriage, and her "worst" nightmares of being abandoned have come true. She's scared Shiva will leave her alone at her most vulnerable.
Which is why she becomes more and more ticked off whenever the concept of "husband/wife protecting each other forever" comes up. I think her words are misplaced, but I think her goal is the same: Get Shiva's attention. Whether he hates her or learns to like her, that attention is what will give her the solace she needs to live through, knowing that at least one person in this world looks to her.
Now that I'm thinking it, maybe that's why all her misplaced anger is placed on Shiva alone. Out of everyone in the house, Shiva gave her the most amount of attention growing up. Now that his attention is diminishing, she keeps poking his buttons in every way possible--hoping they could return to their status quo. In the process, she herself is forgetting that she is no longer just Raavi but Raavi Pandya (wife to Shiva, and the bahu of the family).