She could go online and request a 120-day extension of time to pay without setting up a formal Installment Agreement. That gives her 4 months of breathing room.
Then if the adjustment has not been made by the end of that period, she could try calling and requesting an additional extension of 60 more days. If she can't get through, then setting up a formal I/A with the minimum payment might an additional option. For some people, the fee for setting up the I/A might be a small price to pay to retain access to her $900. (She might even qualify for waiver of the fee, depending upon her income)