after she surrendered all right of my house or done legal settlement with her , still she can claim my property in near future?

This is Rahon Nayak, I stay in Mumbai. My father had second marriage in year of 2008, after my father demise, my stepmother no longer to stay with me so she moved to her parents house. After my father demise, i turned owner of that flat in my Mumbai house because my father had been nominated me so that I turned owner of the house and all my bill copies come under into my name My stepmother hasn't owner of the flat because my father didn't make her nominated into that flat. On 2022 I had done legally settlement with my stepmother and by making affidavit of legally she surrendered all rights of my property so in near future she's has no right to claim after her surrendered. But after doing legally settlement with her and after her surrendered all right of my property, Can my stepmother still can do reopen that case for claiming my property in near future? because she having marriage certificate that why. With help of marriage certificate If she does that, can she succeed to claim my property or reopen?