list of documents required for ILR SET M

Hi there forum members i am planning to apply for my wife and daughter ILR on five year route, she was already in UK when she switched her application to marriage route and she got her first visa extension approved on 23/03/2021. can she apply on 23/03/2026 - 28 days i.e 21/02/2026 ?
Second question is regarding my daughter does she needs to apply for naturalisation or ILR with my wife?
Third question is regarding income i am self employed and relying on Category F last year full accounts and accountants certificate of confirmation just to double check my income threshold is £22400 i.e 18600+3800 for dependent am i right?
i will be providing all of the other relevant documents . please advise on that.
Thanks

Yes they can apply on that date.

Non-UK born children must be added, UK born children do not need ILR and can be registered using form MN1 as British (children do not naturalise)

Ensure to read the income guide: https://assets.publishing.service.gov.u ... rement.pdf