If there was anything romantic or sexual between the two of you, or she wanted a romantic or sexual relationship which you resisted, then her threatening to fire you if you move out would almost certainly be illegal sex-based employment harassment or discrimination, and you could contact the federal EEOC to file a complaint. You may be entitled, in this case, to compensation.Otherwise, however, it is legal: an employer may lease or rent to an employee; and without a contract, you are an "employee at will" with no right to a job, who can be fired at any time, for any reason--including that you no longer wish to live with her. Bear in mind that you have essentially no legal protection (other than against certain kinds of discrimination/harassment, such as sex-based discrimination or harassment; see above) as an employee at will, so she can continue to hold this over your head, to threaten your job, etc. This is not a good situation; better to end it now even it means losing your job and having to find another, or else you are likely to find her continuously trying to control you through your job.