Loss of family member, day 2

Sometimes I feel as if I am just being paranoid. Then some days I know without a doubt that they are out to get me. Husband got a text from my younger sister, offering to drive me to the funeral, out of town. I explained to her 3 times about my health, but she keeps insisting that I will be ok to make a 600 mile trip. (Will anybody listen to me?) She says it will be fun. I again sent her a detailed text on my medical health issues. Haven't heard back from her yet. But in the meantime, I found the first text from her, informing me that our sister passed, and that it was my fault, and that she (older sister) did nothing to me to make me hurt her like that. My fault?

Should I say something to her, or just keep my mouth shut?

BTW...that trip, if I went with her, definitely would NOT be fun!