Flight cancelled "continuous residence" requirement

[ksll]

My elderly mom is in India and has return ticket in May, which is at the end of her sixs month stay outside US, but airline cancelled the flight due to corona and at the present situation it does not seem travel is possible or advisable .
If she stays more than six months outside US, does it break "continuous residence" requirement i.e  “the statutory period” when she is eligible to file naturalization at the end of her 5 year green card status ?
Could you please sugegst what is the best course of action in this case, not to break "continuous residence" requirement ?
 As per USCIS site "Absences of more than six months but less than one year may disrupt an applicant’s continuous residence".

[Priyanka279]

I have a similar question, it's just that my mother went to visit India and got her ancle fracture and due to her knee replacement for both the knees and heavy weight she took more than expected recovery time in which 6 month return was surely impossible, but now due to covid she is not able to travel back and her 1 year time will be over by June end. 

Not sure if this time limit is increased and she can return without any additional documents or what needs to be done?