Best answer by mattj3135
For future reference Boost will never cut off supply of an evening or weekend and they also provide an emergency credit facility which, by looking at your screenshot is still available and would automatically kick in providing 24 hours of supply as a minimum once out of credit.
Is your mother registered with the boost priority services scheme? If not it would be worth reaching out the the lovely customer care team asking to join the register and they'll take care of it.
Hope this helps