221(G) in Visitor Visa Renewal

[h1_holder_06]

Hi:

This question may have been asked before and answered but a response will be appreciated.

I have no father. Mother's 10 years US visitor's visa expiring July 2nd. Applied for renewal by dropdown in Mumbai. Got 221(G) and called for fingerprinting and interview.

She visited us 5/6 times and we got extension of stay in the US (while she was here) 3 times (she stayed 9 months, months and 10 months). Never overstayed. She also visited my sister in London for 5/6 times and also visited Germany, Belgium etc in 2010.

She is going next week with my sponsor letter, bank statements etc and her India property/bank statements.

What to expect in interview? Any idea what questions they are going to ask?

I am the only son and nervous. I am on H1 B.

Please any pointers/resources/answer would be helpful.

Thanks
Rav