Kudos to you for taking your girlfriend to the hospital. When you wrote she was “too far gone,” I hope that meant only too far gone to transfer to another hospital. That is, I hope the first hospital was able to save her.
These stories are so common. In fact, I was misdiagnosed myself two years ago with a non-life-threatening condition. Then, a few months ago, I went to a different doctor, who was shocked by the first doctor’s diagnosis and immediately diagnosed me correctly. It turns out, it was life-threatening. In fact, I just finished treatments.
OTOH, I knew a woman who was diagnosed with a life-threatening condition. She underwent treatments that caused serious side effects. Later, the doctors told her they made a mistake - she never had that condition.
Yes I meant that she was too far along to try to transport. They operated on her immediately. She came out ok.