The beneficiary may update their status at NVC phase.

Check to determine if priority date is current and contact NVC.

Yes as long as the visa bulletin is current.

No, there is no requirement that she stay in the country for two years post acquiring residency.

It will likely take many months which timing is unknown until interview is scheduled.

Yes, she appears eligible to apply for citizenship.

You may follow up at any time through contacting USCIS or your local Congress person for assistance.

You should be able to request an extension through an infopass appointment.

You should bring the final disposition with you at time of interview.

You must be domiciled in the US when the affidavit of support is submitted but you may submit the I130 prior to this.