Employee Category Considerations
You have not mentioned the category of the employee, i.e., whether she is in the worker category or staff category. The worker category entails following the procedure of issuing a show cause notice, conducting a domestic enquiry, issuing a second show cause notice, and, after considering her past history, dismissing her.
Executive Category Approach
If she is in the executive category, it is advisable to call her, explain in person, and persuade her to submit her resignation letter. Based on that, you can relieve her. You can also offer to pay one month's salary and release her immediately, providing her with a certificate. If she refuses to submit her resignation, then you can terminate her or inform her that she will be terminated if she does not resign.