Thanks for the query.
Follicular cysts of the ovary are benign cyst
that develop in the ovary.
The main cause of this follicular cyst is hormonal
Treatment is oral contraceptive pills
after a periods of 2 months observation for spontaneous resolution.
So i suggest you to wait for 2 months and repeat ultrasound
If follicular cyst does not decrease in size, she has to start OC pills for 3 monts regularly.
Hope this helps.