I'm only concerned because you brought up that she's in a rocky marriage and is feeling without purpose. Cynicism can be a symptom of depression. (I have it.) If it's something that deeply bothers you, then I'd be up front and clear about it, but gentle. For example, "Have you thought about talking to a therapist about [complaint]?" No way to tell how she'll handle it, though, since I don't know her. But sometimes just planting an idea in someone's head gives them an opportunity to pursue it later. Even if she shoots that idea down, at least she can come back to that idea in private and perhaps mull it over some more.
You ENTPs are nice people. You like to try to understand what makes others tick in order to better help them out. But since I don't know your aunt personally, I want to get this out on the table just in case: sometimes people can get comfortable in misery and don't want to be helped, and at the end of the day, we aren't responsible for others' thoughts and behaviors. Your aunt is 24-years-old. She's a big girl who can make decisions for herself, and if she makes a mistake, then it was her to mistake to make, and hopefully she'll learn from it.
I don't know what your family situation is, so I don't have a lot of information to go on here - do you and your family depend on the chocolate business? If not, then I wouldn't worry about it too much. It's her business, she has to make the decisions, and hopefully she'll listen to customer reviews and adjust accordingly. I'd help out if her business took a tangible nosedive, but otherwise I'd let her and her employees sort it out. Unless she asks.
I think the most you can do is just lay out your concerns to her. Tell her that because she's your family, you care. If I found out that someone was helping out around my house or work just to get me comfortable before a bombshell, I'd feel manipulated.
I'll have to think about a good story to tell you.

[MENTION=4945]EJCC[/MENTION], do you have any thoughts on this situation? I think it's a tough one because it's involved with family.