A fortune teller, even a true one, can abuse trust too easily. This one is adding common sense on top of whatever possibility she saw in your future, but the thing is, the future changes and nobody can really predict 100% futures, and it's irresponsible to advertise such an ability in the first place.
Likewise, it is not the place of a fortune teller to give you advice. The fortune teller's business begins and ends with giving you the possibilities and paths. And there is almost always more than one path.
If I were reading your fortune, I wouldn't say, "You should totally cut off all contact and not hope for an inheritance." I would give you the paths, factors, and possibilities for various choices, and pretty much nothing else.
For the record, I did cut off all contact with my family and ditched any possibility for an inheritance because there was a strong chance my father would murder me anyways before any of that mattered. I didn't need divination for that.
Anyways, this is ultimately your choice. It is not anybody else's. No fortune teller who was moral would tell you that you must go this or that way, because that is dangerous. We rarely have complete information about someone and all sides of a situation, and it is impossible to gain that much information about a stranger through divination.
Most divination more or less provide mirrors that talk back. There's knowledge inside you, knowledge we don't tell our conscious selves, and often talking to mirrors will reveal it to you. That's the real role of divination. A fortune teller ought to help you know what the mirror is showing you—not perturb your choice with their own judgements.
(There's some divination that goes beyond mirrors that talk back, but it is not really stuff you want to mess with and doesn't have the focus on single lives that most people desire out of a tarot card session.)