You should listen to your counsel advice. Otherwise, why to have a counsel?
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Your attorney is right. Originals are not required at this stage. But she should be prepared to present the originals at her visa interview just in case the consular officer wants to see them.
I generally have clients submit the original signatures on g-325s.
Dhenu Savla, Esq.
This answer does not create an attorney-client relationship and is not meant to be relied upon as legal advice.