I feel guilty about mother's day 6 years later

My mom died 1st wave covid in 2020. Mother's day before she passed I wasn't feeling well and stayed home. I didn't see her that day. She was hurt and told me she was. I was going through a toxic divorce and my depression was all time high. I was sick but my depression had me not wanting to get out of bed. I was married 18 years and was scared to lose my husband. My mom passed on a ventilator 7 weeks later alone in the hospital.

I have lifetime guilt for not seeing her on her last mother's day. I didn't know it was going to be but I should have seen her. My mom passed then divorce was final 9 days later. Lowest point of my life. I am better now but I will go to the grave beating myself up about mother's day. I hate it and what I did.