Nsclc brain metastases

Hi

My mom right lower lobe lobectomy in Apr14 . After lobectomy she's taken chimo & radiation treatment. No problem up-to Dec 17. But last month little headache & vomit then we going to PET CT.  In PET CT right frontal lobe brain metastases lesion around 16 mm. We going to doctor & doing Radio surgery. Now anyone suggestions me after radio surgery which is recent good treatment..