This is typical of Munchausen Syndrome. She is able to function on a daily basis and is non compliant with any mental health treatment. She is also fully aware she is lying, thus medication won’t help either. There really isn’t anything to be done.
I am reminded of one long article I read about a Munchausen by Proxy case where a mother was tried and arrested for abusing her daughter. Despite the fact she would remain in prison for the rest of her life, she would still fake afflictions for attention in prison. When visited by a family member, she had apparently learned sign language in order to pretend to be deaf, only for this charade to fail when the family member threatened to leave if she didn’t stop the act. Maybe someone knows the article I’m talking about.