Sorry to hear that you have problems with your boss. Stress will cause a lots of negative things - you will feel tired and bad, it can has an effect on your work, realtion with the other workers and clients. So all in all if the situation won't change you should leave and find a place where you can work pacefully. If you work in full time than basically you spend more time in the salon as at home, so the place where you work really matters! You need to feel good, it must be pacefully, no stress etc.
To solve this you can sit down with the boss to discuss the situation, if she won't change than you should leave.
I hope it will be better soon!