Am I wrong for telling my son I don't want his wife over my house anymore?

I had my son when I was 15 so I was a pretty young mom. My son is 24 now, my daughter is 17, I have another son who is 14 and my boy/girl twins are 12. I've tried to get along with my son's wife but I don't think she likes me. The first time I met her she made comments on me not being my son's mom because I clearly look too Asian. I'm Asian and my son's dad is mixed with white and black. My son doesn't look all that Asian but I didn't take kindly to her comments. I'm currently battling cancer and going through chemo. My oldest daughter was at my son's house and she told me she was listening outside my son and DILs room and heard them arguing and she recorded it and recorded my daughter in law telling my son to convince me to stop my chemo and just go peacefully because I have a large life insurance policy that he and his siblings own. He was yelling at her saying he would never do that and she for real said "So you're picking your mommy over me." Talking about my life. She wants him to convince me to stop fighting for my life so they can have money from my life insurance. I called my son. Told him I heard the conversation He said he was sorry and he made it clear he told her he wasn't doing that because he wants me to keep fighting. I told him I don't want her at my house anymore. I won't talk to her. I feel unsafe. Maybe that's an exaggeration but knowing she wants me dead for money makes feel really unsafe around her. I know her not being able to come to my house may mean I see my son less and that kills me but I don't want her around me. At least not while I'm vulnerable.