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Good day your question has been forwarded to me to see if I may be able to assist
I am not quite understanding the concern you have. Is it you that will be finding the new tenant?
Thank you for the additional information.
The rights you have will depend largely on what is agreed between you both as this will be governed by the law of contract. What I recommend though is for you to have a fixed time for the lease to come to an end whether she finds someone or not. That way, you do not find yourself locked into the lease for an endless amount of time while she tries to replace you. Another option is for you to propose you also being able to recommend persons to her. That way, you may have some say or control too in getting a potential new tenant.
All in all though, there is no legal recourse if she decides not to find someone unless you specifically agree to what course she be adopted in relation to finding a new tenant.
Hope I clarified things for you. Kindly let me know if I may be of further assistance.
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All the best