It is up to the CBP ... they can institute expedited 'removal' which is bad and they tend to do more often than not.
Voluntary Departure is discretionary ... they need a SUPER GOOD reason to let her off 'easy' with VD.
Meet with an attorney.
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No, but they can allow you to withdraw you application for admission. You cannot call the officer. Only an attorney can represent her. The officer will not be able to communicate with you about her case.
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1. No v/d, but to stop her appears absurd.
2. No, they won't take your call.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.