Some reflections:
1) Abhay is a fool, but his loss is Diya's gain. All Abhay gained was revenge, but Diya gained a husband. I'd say one up to Diya 😃 !
2) Low expectations and high standards! Diya has zero expectations from Ratan. Remember she knows his views on marriage. However she does have high expectations of his regard for her. She knows he cares for her, and that's the friendship aspect.
3) 'Now you can go wherever you want' She fully expects Ratan to run; to adventure, to clubs etc. Would she prefer it? She's shell-shocked at present.
4) She genuinely doesn't know how to behave with Ratan. When Ratan impatiently walked into the house, pulling her along, then tried to undo the marriage knot, she was mute before lifting the scarf from his neck. She would have scolded him before, but now she's his wife, and the old norms are gone.
5) She has a few more allies in the house now. The taunts will come, but at least she's not so alone. Still her in-laws are resigned, not genuinely welcoming. She'll have to work hard to win their trust.
She'll have many tests to come, but she's now at her sasural and she'll have to cope.