My wife got H1-b approval in OCT ’06 valid till OCT ‘09. Since then due to medical condition she never worked and stayed in US as dependent. She doesn’t have Pay stub/ W2. She went back India on Sep 09, stayed 5 months and got H4 stamping to re-enter US. Employer A did the H1 and now she got offer from Employer B.
Now
1) Is it possible to do COS (H4-H1B) by EMP B.
2) In such case what would be the legal issues?
3) What are the DOC‘s she/Me has to provide?

Thanks
Takalsa