Tier 2 ICT dependant to ILR rules and documents needed

Dear Team,

Hope you are doing good. Apologies if this is too long.

I have got my ILR in 2015 via Tier 2 ICT long-term visa in 5 year route. My wife came to UK in 2013 October on as PBS dependant on my tier 2 ICT long-term visa. She continued on that visa including extensions till date.

She is now trying to apply for ILR visa. I understand we need to apply with SET (O) But not clear on documents needed. Do I need to submit proof of income and minimum balance. Can we show savings in help to buy ISA scheme as in my current account minimum balance is not maintained? Or can I submit letter and payslips from my company? We have below documents, do we need anything else.
Council bills last 3 years,
Rental agreements last 4 years,
my bank statements ( she is not in that),
her bank statements last 1 year,
marriage certificate,
life in UK test
English proficiency certificate
Passport and BRP cards for both.

Please help if any thing else is needed for submitting her ILR application. Thanks in advance for your help.

Do I need to submit proof of income and minimum balance. Can we show savings in help to buy ISA scheme as in my current account minimum balance is not maintained? Or can I submit letter and payslips from my company?

None of this is required.

Thanks for quick reply. But can you confirm if the other documents I stated are enough or do I need anything else.