Payment plan for unpaid rent

[Linda Roberts]

The tenant called me to explain that she has a medical issue and cannot pay next month's rent on time. Later, she informed me that she is unable to work and, as a result, can only pay some portion of the rent until the end of her lease. There are four months left on the lease, with one already covered by the last month's rent.  She proposes to use her security deposit money to cover another month's rent, to be paid once it's released. Lease ends on July31. She intends to pay the remainder by September. It seems unrealistic that she will pay for 2 months after moving out of the apartment. What agreement would make sense to reach with her? What is the right course of action in this situation? 
Appreciate your help.