Hi Rory,

You must read this with regards to the citizenship. I believe your wife can apply right away. In the past, you have to wait for another year to get the requirement of living in the UK for 3 straight years (the Spouse visa or FLR at that time was only valid for 2 years, hence waiting for another year when you get the ILR).

https://www.gov.uk/becoming-a-britis...ritish-citizen
https://www.gov.uk/government/upload...on-v2.0EXT.pdf

For the BRP card, yes you just have to renew it if she hasn't got the citizenship yet by then.