Elderly parent and sertraline

My 91 year old mum is currently on 150mg sertraline for anxiety and depression. She’s been on sertraline nearly a year gradually increasing from 50mg. She’s been taking 150mg for 3 months. I’ve noticed over the last few weeks anxiety is creeping back to the point its affecting quality of life and lack of appetite. Anyone else experience this with elderly parent and if any other medication was added or increased?