H4 visa extension through dropbox if H1 employer is changed

[kollapudi]

Hi,

 

My wife and 6 yr old kid are planning to travel next week. I came to U.S on H1B in 2014 with employer A and wife, kid with H4 visa. I am going to join employer B in next week with approved H1B transfer approved petition.

Can my wife (along with my 6 yrs kid documents) go for dropbox for her H4 visa extension. Please note that my employer got changed from the initial petition.

 

Thank you,

Chandra