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Thanks for your question.
I assume the area has not been adopted by the local authority as a highway maintainable at the public expense.
If the area is not owned by the person parking there and there is no express right evidenced in the deeds of her land/the area itself then she can only claim a right to park there by proving a right has been established by prescription.
To do this she would have to prove with documentary evidence (ie. witness statements from earlier use) that the right has been used for 20 years. If she cannot do this then she does not have any right to use it.
If she continues to use the land then you may have to get a solicitor to write to her advising that she has not right to do so.
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