My mother nearly bled to death in the mid 1950s, she had the same type of blood. We lived in a small town, with a small hospital. They asked for blood over the radio and people with O- rushed to the hospital to help her. Luckily she survived and lived another 45 years.
I know that today they don't normally give a transfusion straight from one person to another. However, if she or the family signs a waiver of some sort, maybe the hospital will use their brains and hearts instead of cowering in fear of lawyers.
My wife used to get calls from the Red Cross whenever there was someone who really needed type AB- blood. It would depress her so much when she would go in and they refused to take any because she was slightly anemic.