Mothers mental health. To handle this?

This problem is related to my mother. I am staying with my mom & I have no siblings. I am 27 & my mom is 60+. I am a working professional 5 days a week. My mom stays alone when i am out. She has got very very veryyyyy cranky lately. she doesnt listen to me. She feels watever she says is right. Even when she is not. she feels everyone is against her including me. How much ever I try she doesnt listen to anything. I am not able to handle her. I feel like stayin out of the house most of the times due to this. But I want this to end. Theres no peace at my place. As there is no one else in d family I dont have a support to say all this to her. I dont know wat to do. I spoke to our family doc she said its due to her age. But It has become very difficult for me now. please if anyone can guide me wat i can do to handle this?