Hi there. I'm SO sorry you are going through this rough time. The pandemic has really put a strain on a lot of relationships. We've experienced a lot more time together with close family, and less time with friends our own age and less time doing activities that we used to enjoy. Keep in mind that this has probably been hard on you AND on your mom, and you're not alone.
As a parent, I can tell you that there is often a LOT of stress between mothers and daughters during the teenage years. Even though we love each other very much, it's a stressful time of growth, and it is not uncommon to see a lot of conflict. What I can also tell you is that it usually gets MUCH better as you grow older. There were times when I thought my daughter and I would never, ever have a good relationship again, but now that she's not a teenager and is out on her own, we have a wonderful relationship.
I don't know how old you are, but please don't give up. You know in your heart that death is not the answer - it is a permanent solution to a temporary problem. Do you have access to a counselor? It sounds like you would both benefit from family counseling. If you don't have access, have you discussed your problems with a trusted teacher or adult friend?