H1B, H4 Visa

Hello all,
This website is really great, found lot of info.

this is for my sister, she was hired by my company and her h1 got approved, she is trying to go for visa interview

i would really appreciate it if some one can help me here.

i went on to the immihelp website and looked up for the documents required http://www.immihelp.com/visas/h1b/h1docs.html

i asked my employer(her prospective employer) to send th below documents

I-797 -- the original notice of approval( i am sending just the tear off not the whole paper),

The complete I-129 petition submitted by prospective employer(photo copy).
 
Letter from petitioning employer confirming employer's intent to hire the applicant

Offer letter mentioning the title,salary, benifits & start date.

Also pictures of the office from inside and out side.


My question is , does she have all she needs to attend the interview ?

i see some people here are mentioning

unemployment report(what is this ??)
notarized list of employees
tax returns of the employer(what years tax returns ?, last two years or last years ?)

any help will be highly appreciated

Thank you
And all the best to all