I am sorry about your friend. But I doubt her death was caused by birth control pills. Everyone I have known has been on birth control pills. They had no side effects. They prevent ovulation. One does not die from that.
You can doubt all you want, but I was there and it is a fact. I was also hospitalized - twice - with severe side effects after getting on different versions of the pill. Sorry if this information doesn’t fit it with what you want to believe.