Extension of B2 visa

[lr_2016]

Hello,
I have applied for citizenship(N400)and my interview is scheduled for April 12th.
My mother is here with me on B2 visa and her I94 for 6 months stay expires on April 24 and her 10 year B2 visa expires Jan 2017.

I am interested in applying for her green card for her once I am eligible.

Can i extend her stay and then apply for her GC once I get my citizenship in a month or two.

Can I expedite my citizenship process?

I lost my father and I dont want her to be staying alone if she returns to india and then comes back.

What are my options? Please advise.

[JoeF]

The B2 does not allow immigration intent, and an extension for being able to go for a GC would be incompatible with that.

The citizenship process can't be expedited.