Mounir Ali

A job offer will not help your case before the visa is issued......Consulate Officers consider CURRENT INCOME of the petitioner and joint sponsor BEFORE issuing a visa....Any job offer you have is irrelevant.

Your ability to work is a positive factor overall in the determination for public charge, but it doesn't meet the requirements for the I-864 nor completely alleviate the concern.
The CO will evaluate the totality of her circumstances, along with that of any joint sponsor presented. From that, they will make a public charge determination. Nobody other than the CO can know the result of that decision beforehand, although you and your spouse know your circumstances better than anybody so you can probably already have an idea if your case makes sense or not.
 
A job offer is not a job...the US government does not rely on you getting a job or maintaining a job - it needs an assurance in case you don't (or can't...if something happens to you) work.
 
Edit: Also see this section of the FAM for some more info: https://fam.state.gov/FAM/09FAM/09FAM030208.html#M302_8_2_B_2

She gets tired a lot ... the goverment test her every year and for that reason they give her cheque each month 

1.  No
2.  No

As long as he qualifies as a joint sponsor 

Depends on how the officer considers your wife's total financial picture......