Should veiled lawsuit threat affect how we approach disciplining difficult worker?

Q. We have an employee who has been a constant source of drama and complaints within her department. When her manager sat down with her recently to discuss a confrontation she had with another co-worker, she “casually” mentioned that she has been trying to get pregnant, and “wonders if the stress of the job” could be the reason she has been unable to conceive. What are we supposed to do now?