Advance Passenger Information Question

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Myself & my Thai wife have booked on KLM to return again to Thailand for 3 months from the UK.

 

My wife holds British & Thai passports and will be using both.

 

My question is about the Advance Passenger Information we have to enter on the KLM website.

Does my wife record British or Thai Nationality & Passport details?  Is this information for only airline 

use, or is it shared with British or Thai Immigration or both?

 

Maybe you can use Thai API for the flight to Thailand and then ammend the API to British for the 

return flight to the UK ?

 

Any advice much appreciated. Thanks