British passport application document (previous name)

[tier21419]

My Mrs applied for her naturalisation and in there she has declared her name before our marriage and the name she is using now (her passport has her current name).
She used this passport (this is her only passport) to enter the UK i.e. she has never used her previous name in the UK.
Wondering if this will be a problem when she will apply for a UK passport. As the online passport asks for other names, which she will declare but will the application ask for any document as proof for the previous name (as she does not have any document for that name)?

[CR001]

You are overthinking completely.

[tier21419]

You are overthinking completely.

Thanks, CR001 for your reply.