1. Will her job continue once she moves back to the US, if so evidence from her Employer, otherwise a Joint Sponsor. Expedite, what? On what basis.
2. I do not what she has, but she might want to update her DL, Bank Account, Credit Cards etc on her next trip home. Sometimes it is best for the USC to move first. I suppose how long the job process would take will depend on what she does, process takes about 18 months so quite a bit of time in a changing employment market.