If you work in New York and live in NJ, how do NJ state taxes work?

I know if you work in NY and live in NJ, you still need to file taxes. However, can you actually be double-taxed? For example, can one actually OWE taxes in a state they do NOT work in? I’m only asking because my gf’s accountant is telling her she owes a lot of income tax for NJ state, even though she doesn’t even WORK in NJ. I’m questioning this. Any feedback is appreciated.

Max New York Life sucks?

MNYL Sucks….!!!! The company is denying claim settlement to 63 years old widow who recently lost her young widower son leaving behind a 6 years child to be taken care of by the grandmother. Its all about our ignorance and humility that they are taking advantage of. They are still using the age old formula of divide and rule in their business strategy. Lets all unite and fight back once so that they dont repeat the same with others….! We must alert all the Clients of the company to ensure that they take extra care to ensure their family gets the money in case they are not there….!!!!