Tenant always pay rent late

[Chipo Asare]

Hello! I have a tenant who is always 2 weeks late with her rent and she is refusing to pay the late payment. She tells me that she’s been my tenant for more than 10 years and now she’s going to school so she can not afford to pay extra $50 late payment. What do you guys think? Should i start the process of moving her or not? This has been going on for more than 6 months