Which form to request overstay for B2 ?

[BradandKaneko 0]

My Mother in law is stuck here due to COVID-19. SHe has a visitor visa and was going to stay for two weeks, until covid hit.  She is from Guatemala and they have closed their borders to all international flights. It was a same day notice, so no chance for her to return unfortunately. Regardless, Hopefully that will change in the next month or so (the flights)  but, given that they recently put even harsher restrictions on their own citizens around quarantine, we don't have high hopes of that happening anytime soon. 
To be safe, we want to know what form or process we would follow to ask for permission for her to stay longer, so she doesn't break any rules. 

 

Edited May 20, 2020 by BradandKaneko
fixin tings

[cd37 229]

File form i 539 for extension of stay.