Extension of stay after staying 6 months on B visa

In Oct I was diagnosed with cancer and my mother came to US on B visa in Nov to provide care for me. During this time I have underwent 2 surgeries and require further care for a couple of months. My mother will complete her 6 months in the country at the end of April and that is when her I 94 runs out as well. I have filled for her I539 2 months ago but have not received any decision. Can she continue to stay lawfully in the country even though she has stayed 6 months continuously?
Is there any way to expedite the decision?
your help will be greatly appreciated.

thank you


Active Member
just like newacct said, your mother can stay as long as I-539 is pending. i do hope that her explanation letter for her extension is not to take care of you because that would not be the intended purpose of B2 visa.

i submitted my dad's extension of stay on 02/28/18, and his got approved on 03/30/18.