I thought she had to wait for a year after she gets ILR to apply for citizenship if she wanted. However I recently came across this on gov.uk which says that:
and the next article linked from there spells out the conditions:You do not need to wait 12 months to apply if you’re married to a British citizen.
- Above 18 -> yes
- Are married to a British Citizen -> yes (since I am now a British Citizen though at some point in the past I wasn't)
- Have ILR -> yes
- Lived in the UK for at-least last 3 years -> yes, for 5 years in-fact and minimal vacation leaves (totalling less than 60 days)