Changes in your wife's passport are not needed. Marriage certificate should be enough for that.
For proof of relationship, Please follow checklist thoroughly and if you have any specific questions then please ask them.
like, let's say you have question on what kind of photos should be attached,
then try to show all the timeline. We attached every photos of these different occasions
1. Roka
2. Haldi
3. Marriage
4. reception
5. Other than marriage and reception, visit to extended family home
6. airport (when spouse was leaving)
7. pictures of wife with in-laws when husband was away (Diwali, lohri, birthday celebration at home etc)