this will create problems.
Are you going back to USA on a job, it is not just about paystub. If you can satisfactorily explain your leave of absence and expectation of job to continue when you get back.
Can you independantly show that your mom can support herself with enough funds available.
Your mom being a recent widow, can she demonstrate strong ties to India, ensuring she will be back.
And as it appears that the visa dates are not available for next 4-5 months, your mom is unlikely to get a date before that. That may work out to your advantage in the sense that you will go back have a job, provide all the support and the supporting documents from there. Your mom living here for some time and managing might demonstratye that she has some ties.
Understand, it is not just about you getting here there this time to be with you, but she will have to come back as well, and then stay on her own, if that is the case
she cannot stay with you long term till you get citizenship and sponsor her GC. And your stay outside the country will delay your citizenship as that time will be subtracted from required 5 years after GC.
think and then plan