I'm on L2B visa expiring in JUL 2013, but I-94 is valid till Dec 2015. If I apply for an EAD, what will be the expiry date on it

One year from the approval date.

Can my mother file for me?

She can file for you. You cannot get work authorization, nor any change or extension of status until the visa is approved and available.

Me and my spouse have been friends for 2years and 8months.was it advisable to send in application on thesame day of marriage

Yes, it's fine.

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Extension of B-2 visa

You should apply for another extension.

It should have no effect on your current status, nor on any application for change of status.

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You need to file for a replacement card. You may be able to get a temporary card at the local office through infopass, or an expedite, if you...

Sounds like illegal reentry after deportation, possibly for an aggravated felony. Sentence could even be as long as 20 years. Speak with a...

Immigration

If you have a joint sponsor for the affidavit of support, you seem to be eligible.

I don't understand this status from the USCIS. My fiancé and I are really nervous. Is this a denial or what?

Sounds like a denial.

The review of your I129, PETITION FOR A NONIMMIGRANT WORKER was completed. You will be notified of the decision by mail.

The USCIS granted, denied, or granted in part, your application. It will say on the decision, what the decision is, and why.