Thanks for your question.
If there was no formal lease or licence agreement granted to her then she is simply occupying under licence. If you did not agree a fixed term or other provisions with respect to when you would be allowed to terminate her occupation of the property then she has virtually no rights at all.
The right she does have though is to receive "reasonable notice" of termination if you want the property returned to you. To be safe I would give two months written notice (although 1 month would probably suffice) referring to her occupation under licence, you as licensors, her as licensee,the property itself and your termination after the notice period expires.
Once it has expired you can simply retake possession of the property by either applying for a Court Order for possession or simpy by taking peaceable possession of the property by changing the locks.
She will not be able to claim an interest in the property if there were no firmly agreed terms as to length of term or a written lease.
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