I am sorry to hear of your aunt's diagnosis.
You might find it helpful to talk things over with one of our Helpliners. They will be able to offer you practical information and support. The opening times are 9-5 on weekdays and 10-2 on Saturdays. The number is 0808 800 6000. Calls are free and confidential.
I have also attached a link on the factsheet on Exemestane which I thought may be useful
Very best wishes