I agree with my colleague. It is always recommended to protect the underlying status. Contact the company's US immigration attorney for assistance.

Check with the company's US immigration attorney for assistance.

Am I eligible to stay in USA after 18th Feb, as the delay is on SEVP side ? Can I leave US on 18th Feb and re enter on same visa

Work with your DSO and/or US immigration attorney for review and assistance.

I140 RFE responded but still status shows 'RFE mailed'

The USCIS online results are not always exact. Check with your company's US immigration attorney to confirm delivery of the RFE response.

How is work?

No, you have to get the separate stamp for the I751 extension. Contact a US immigration attorney for assistance.

Now I try to access most recent I-94 it still shows Oct 2013 and not March 2014...will she have any problem entering US now?

She should travel with a copy of the I539 approval notice. The system should be updated when she left (even if it's not online), but the approval...

I can do to find out what the hold up is?

Schedule an INFOPASS before the 1 year anniversary of your receipt notice to get a stamp extension for another year. I751s can take over 2 years...

How long before the expiration date should I apply for my EAD renewal?

90 to 120 days. Generally, this office applies around the 60 to 90 day mark. Contact a US immigration attorney for assistance.

Is it safe to approach office of ombudsman for I-485 petition pending for more than 1 year?

I agree with my colleague. Contact a US immigration attorney for assistance.

How long (approximately) continue this process until green card approved? Thanks

I agree with my colleague. Schedule an INFOPASS after 90 days and don't travel internationally without advance parole and checking with a US...