В чешском VFS пару дней назад сказали, что дочь может подать за свою мать по письменной доверенности от нее на английском языке без нотариального заверения. Какие-либо документы, подтверждающие родство не требуются. То есть в теории любой человек может принести, имея такую доверенность. Если также ответят и в Польше, можете взять мой текст в качестве образца:
POWER OF ATTORNEY
I, [Your Name], residing at [Your Address], hereby authorize [Name of Authorized Person], residing at [Address of Authorized Person], to act on my behalf to submit and receive my passport from the visa center.
This power of attorney is granted for the purpose of submitting my passport to the visa center and collecting it on my behalf after the visa has been issued.
[Name of Authorized Person] is authorized to sign any documents, make any declarations, and take any actions required in connection with submitting and receiving my passport from the visa center.
This power of attorney shall remain in effect until the visa has been issued and my passport has been returned to me.
Signed,
[Your Signature]
[Date]