Employment Law Questions? Ask an Employment Lawyer.
Keep track of the treatment in writing. Complaint about that treatment to the employer/owner, so that she knows that you don't like the treatment. Remain respectful and professional in your complaints.
After you've documented the treatment for a little while, give the employer/owner an ultimatum, stating that if the treatment is not corrected you will not be able to work there any longer.
If the behavior is not corrected, quit and file for unemployment. Your evidence will enable you to claim quitting for good cause attributable to the employer.
Now, all that said, it is always a risk to quit and file for unemployment. The state has to determine that they believe, objectively (meaning the average person...not you specifically) would have quit under the same circumstances. As unemployment rates rise, this standard is a moving target, so you have to carefully document the treatment and insure that it's actually bad treatment, rather than simply uncomfortable treatment.