I agree -- try to save the business.

What type of business set-up is there, as far as LLC or whatever? I would be concerned about how much of her nonsense could harm not only the business, but you personally.

If things aren't set up properly, someone could sue and you could lose everything. Not just the business, but any personal assets.

Do you have an attorney to discuss the business with? Just to make sure it is set up in a way that would protect you?

I know it's hard to get yourself put together and go to work a lot of times.

Do you have employees? Is there anyone you trust and who runs things well?

Any chance of phasing out your cousin and getting another business partner? Is anyone else in line to inherit the business on her side of the family?

If there is any way to build positive relationships with current customers and work on finding new ones, focus on that.