Evict tenant breached payment plan contract separate from lease?

[Delroy Henderson Jr]

Can someone help me with this question? I have a tenant under a lease for one year. She breached the contract by missing a payment for 2 months, but i didn't take her to court. I drafted up a prepayment contract where she turns over her security deposit for missing the payment of one month and put her on an installment plan to pay for the other month. The agreement was for her to pay by a certain date. We both signed and agreed to it. She didn't pay by that date. I sent her a pay of leave letter, but she wants to pay me on a date that she chooses to pay on. Now we're running into the next month where she will be late for that payment yet again. Do I have to accept her payment for breaching the contract? And how difficult will it be to evict her from the property if I decide to take her to court?