You said the manager is married to the owner. So the manager IS the owner. Sounds like she is over stressed (possibly a bee-otch no matter what) but she is behaving in an extremely unprofessional manner and creating a hostile work environment. Possibly she is one of those jack-asses who believes because they own a company they are masters over the peons. Yay...lovely place to work I am sure.
Lack of training, lack of direction, lack of management skills makes for a very hostile place. I have worked in some extremely hostile (think getting the EEOC and the national head of G00dwill Industr!es involved), dealt with some NUTTY people, self entitled folks for sure and then I have also worked with some highly professional people (Sherwin Williams is a fabulous company to work for) and now own my own business.
Turn in your notice politely and professionally as possible. IF she asks you why you are resigning I wouldn't hesitate to tell her that the lack of training and the way she treats people are deciding factors. Don't lose your cool, speak like you are talking about the price of eggs this week. You never know, this may be what this woman needs to hear that her management style is what is causing problems. You may want to find another job or have another one lined up if you need the $$.
Good luck and don't let this bad experience mar your own enthusiasm. Not all people are whack jobs at work.