RAKHI, Thank you for this helpful information. Looking at the application form I find a problem because my daughter was adopted by me when she was 8 years old, and has no official birth certificate. She was also legally adopted by my husband in the UK when she was 10. I note also via Wikipedia (which is not always accurate) that SS numbers were not issued for children before 1986 (my daughter was born in 1979, and we do not know her birth name).
Also I would be very reluctant to send original documents to the USA, especially as during the time taken for them to get there and be assessed, they well be needed back here in the UK.
Can a UK bank legally insist on a person supplying a Social Security Number?
I am sure this would help. I wish you good luck.
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