Unfortunately this is not an option given set of facts.

Yes that should be sufficient for work purposes.

Yes the passport is sufficient enough.

Contact attorneys directly for review prices.

Yes, you may contact the embassy directly to inquire.

It is not advisable to withdraw the petition simply to apply for a visitor visa, as there is no guarantee that this would be approved.

Yes, these incorrect entries can delay the processing.

You could petition for her as a sibling although that takes many years.

She may apply for a visitor visa on her own. Consult with an attorney for guidance.

No, you must establish eligibility for a waiver separately.