Wow! Thanks for asking this question, I have a similar issue with a cousin.
She was born a cousin (niece of my father) with her father's surname.
At age 5 was adopted by my paternal grandparents (then got their surname as birthname, which actually gave her the same birthname as her mother).
She married, got a new surname, and had 2 children who have that LNAB.
Now she does not like married name and changed to an entirely new middle name and last name.
So far her profile has only her adoptive LNAB because I do not want to start anything to 'discuss' with her.
I have all the documentation of actual birth, changed birth cert and 'generation jump', so I can add it all later.