Unfortunately, your Aunt may well be caught in a trap that many sellers find themselves in each year.It does depend on the contract that she signed with the estate agent and the terms under which she agreed their representation.
If they originally had sole selling rights, then the chances are that there is a period of time during which they are contractually bound to receive the agreed commission regardless of whether the agent found your aunt the buyer (usually around three months).
The agent would probably be able to pursue your aunt through the courts if this was
the case, for the amount of commission agreed in the contract (often in the region of two percent of the sale value of the property). They may also be able to sting her for their legal costs in recovering their commission.
It is possible that the agent was not instructed with sole sellling rights, in which case the situation would be different and she may be able to avoid paying them.
I would really have to take a look at the contract to be able to shed any further light on the situation.
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